Regex matching letters – including non-latin, but excluding emoji - javascript

I have a need for a javascript regex that would match words in any language, but fail for emoji or any other character. Solution here: Regular expression to match non-English characters? matches all letters plus pictograms and emoji ([^\u0000-\u007F]+).
Modifying it a bit seems to accomplish what I need, but I'm not sure how safe it is: ([a-zA-Z]|[^\u0000-\u007F\u200d-\u3299\ud83c-\udfff\ufe0e\ufe0f])+
Example:
America🇺🇸
Österreich🇦🇹
Россия🇷🇺
Ελλάδα🇬🇷
Should only match letters and stop before emoji. Should not match emojis with letter representations, for example: 1️⃣#️⃣*️⃣
Relevant: http://www.unicode.org/Public/emoji/5.0/emoji-variation-sequences.txt
Bit of context:
I'm trying to patch this parser: https://github.com/Khan/simple-markdown/blob/master/simple-markdown.js#L1304 to break on emojis, because currently it matches as much text as it can. Without that matching/replacing emoji via that parser is problematic. Removing \u00c0-\uffff from the highlighted regex accomplishes what I need, but parser starts breaking up words. Some languages (cyrrillic) get broken per letter, which is not good for performance. I need to either patch that regex to allow letters, but not emojis, or put a regex that catches all text before it.
Edit: Added some examples
Edit: Added language restriction

I found a solution here: https://mathiasbynens.be/notes/es-unicode-property-escapes#word
Essentially /[\p{Alphabetic}\p{Mark}\p{Decimal_Number}\p{Connector_Punctuation}\p{Join_Control}]/u given Unicode property escapes support.
Until \p is natively supported in JavaScript, you can transpile this regex.

\pL matches a Unicode letter.
You might want to combine that Unicode category with \p{Pc} (connector punctuation) to also catch word combinations like it's or doesn't by using a character class: [\pL\p{Pc}]

In JavaScript before ES2018 (which got added natively to many browsers in mid-2020), the answer is "roll your own" 😱
Here is what I made, after consulting Wikipedia and using this SO answer for cleaning up the endless list of unicode codes:
const westernEurope = '\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u01BF';
// (u00D7 and u00F7 are math symbols)
const cyrillic = '\u0400-\u04FF';
const japan = '\u30A0-\u30FF';
const chinese = '\u4E00-\u9FA5';
const re = new RegExp(`^[a-zA-Z${westernEurope + cyrillic + japan + chinese}]*$`, 'g');
You should also consult Wikipedia if you need other languages or want to double check this (for instance, I only included basic Cyrillic in the cyrillic codes above)
If you can use the latest JavaScript in your project, this answer explains how Unicode Property Escapes are just what we need

Related

modify javascript regex with cirilian and latin language in urls and email [duplicate]

I have an jQuery function for word counting in textarea field. In addition its excludes all words, which are closed in [[[tripple bracket]]]. It works great with latin character, but it has a problem with cyrillic sentences. I suppose that the error is in part with regular expression:
$(field).val().replace(/\[\[\[[^\]]*\]\]\]/g, '').match(/\b/g);
Example with both kind of phrases:
http://jsfiddle.net/A3cEG/2/
I need count all word, including cirillic expressions, not only words in latin. How to do that?
JavaScript (at least the versions most widely used) does not fully support Unicode. That is to say, \w matches only Latin letters, decimal digits, and underscores ([a-zA-Z0-9_]), and \b matches the boundary the between a word character and and a non-word character.
To find all words in an input string using Latin or Cyrillic, you'd have to do something like this:
.match(/[\wа-я]+/ig); // where а is the Cyrillic а.
Or if you prefer:
.match(/[\w\u0430-\u044f]+/ig);
Of course this will probably mean you need to tweak your code a little bit, since here it will match all words rather than word boundaries. Note that [а-я] matches any letter in the 'basic Cyrillic alphabet' as described here. To match letters outside of this range, you can modify the character set as necessary to include those letters, e.g. to also match the Russian Ё/ё, use [а-яё].
Also note that your triple-bracket pattern can be simplified to:
.replace(/\[{3}[^]]*]{3}/g, '')
Alternatively, you might want to look at the XRegExp project—which is an open-source project to add new features to the base JavaScript regular expression engine—and its Unicode addon.
Beware of using range of cyrillic letters, it may contain unnecessary characters within.
There is bulletproof regexp contains only cyrillic letters:
/^[аАбБвВгГдДеЕёЁжЖзЗиИйЙкКлЛмМнНоОпПрРсСтТуУфФхХцЦчЧшШщЩъЪыЫьЬэЭюЮяЯ]+$/
You can add the /u flag, which allows you to work with Unicode.
When you add this flag, your example works.
Alternatively to the most upvoted answer, you could do it like this:
.match(/[\w\p{sc=Cyrillic}]+/ug);
You can read more about it here.

Regex match any word followed by a number (but the word can contain special characters like diacritics or accents) [duplicate]

I've looked on Stack Overflow (replacing characters.. eh, how JavaScript doesn't follow the Unicode standard concerning RegExp, etc.) and haven't really found a concrete answer to the question "How can JavaScript match accented characters (those with diacritical marks)?"
I'm forcing a field in a UI to match the format: last_name, first_name (last [comma space] first), and I want to provide support for diacritics, but evidently in JavaScript it's a bit more difficult than other languages/platforms.
This was my original version, until I wanted to add diacritic support:
/^[a-zA-Z]+,\s[a-zA-Z]+$/
Currently I'm debating one of three methods to add support, all of which I have tested and work (at least to some extent, I don't really know what the "extent" is of the second approach). Here they are:
Explicitly listing all accented characters that I would want to accept as valid (lame and overly-complicated):
var accentedCharacters = "àèìòùÀÈÌÒÙáéíóúýÁÉÍÓÚÝâêîôûÂÊÎÔÛãñõÃÑÕäëïöüÿÄËÏÖÜŸçÇßØøÅåÆæœ";
// Build the full regex
var regex = "^[a-zA-Z" + accentedCharacters + "]+,\\s[a-zA-Z" + accentedCharacters + "]+$";
// Create a RegExp from the string version
regexCompiled = new RegExp(regex);
// regexCompiled = /^[a-zA-ZàèìòùÀÈÌÒÙáéíóúýÁÉÍÓÚÝâêîôûÂÊÎÔÛãñõÃÑÕäëïöüÿÄËÏÖÜŸçÇßØøÅåÆæœ]+,\s[a-zA-ZàèìòùÀÈÌÒÙáéíóúýÁÉÍÓÚÝâêîôûÂÊÎÔÛãñõÃÑÕäëïöüÿÄËÏÖÜŸçÇßØøÅåÆæœ]+$/
This correctly matches a last/first name with any of the supported accented characters in accentedCharacters.
My other approach was to use the . character class, to have a simpler expression:
var regex = /^.+,\s.+$/;
This would match for just about anything, at least in the form of: something, something. That's alright I suppose...
The last approach, which I just found might be simpler...
/^[a-zA-Z\u00C0-\u017F]+,\s[a-zA-Z\u00C0-\u017F]+$/
It matches a range of Unicode characters - tested and working, though I didn't try anything crazy, just the normal stuff I see in our language department for faculty member names.
Here are my concerns:
The first solution is far too limiting, and sloppy and convoluted at that. It would need to be changed if I forgot a character or two, and that's just not very practical.
The second solution is better, concise, but it probably matches far more than it actually should. I couldn't find any real documentation on exactly what . matches, just the generalization of "any character except the newline character" (from a table on the MDN).
The third solution seems the be the most precise, but are there any gotchas? I'm not very familiar with Unicode, at least in practice, but looking at a code table/continuation of that table, \u00C0-\u017F seems to be pretty solid, at least for my expected input.
Faculty won't be submitting forms with their names in their native language (e.g., Arabic, Chinese, Japanese, etc.), so I don't have to worry about out-of-Latin-character-set characters
Which of these three approaches is most suited for the task? Or are there better solutions?
The easier way to accept all accents is this:
[A-zÀ-ú] // accepts lowercase and uppercase characters
[A-zÀ-ÿ] // as above, but including letters with an umlaut (includes [ ] ^ \ × ÷)
[A-Za-zÀ-ÿ] // as above but not including [ ] ^ \
[A-Za-zÀ-ÖØ-öø-ÿ] // as above, but not including [ ] ^ \ × ÷
See Unicode Character Table for characters listed in numeric order.
The accented Latin range \u00C0-\u017F was not quite enough for my database of names, so I extended the regex to
[a-zA-Z\u00C0-\u024F]
[a-zA-Z\u00C0-\u024F\u1E00-\u1EFF] // includes even more Latin chars
I added these code blocks (\u00C0-\u024F includes three adjacent blocks at once):
\u00C0-\u00FF Latin-1 Supplement
\u0100-\u017F Latin Extended-A
\u0180-\u024F Latin Extended-B
\u1E00-\u1EFF Latin Extended Additional
Note that \u00C0-\u00FF is actually only a part of Latin-1 Supplement. It skips unprintable control signals and all symbols except for the awkwardly-placed multiply × \u00D7 and divide ÷ \u00F7.
[a-zA-Z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u024F] // exclude ×÷
If you need more code points, you can find more ranges on Wikipedia's List of Unicode characters. For example, you could also add Latin Extended-C, D, and E, but I left them out because only historians seem interested in them now, and the D and E sets don't even render correctly in my browser.
The original regex stopping at \u017F borked on the name "Șenol". According to FontSpace's Unicode Analyzer, that first character is \u0218, LATIN CAPITAL LETTER S WITH COMMA BELOW. (Yeah, it's usually spelled with a cedilla-S \u015E, "Şenol." But I'm not flying to Turkey to go tell him, "You're spelling your name wrong!")
Which of these three approaches is most suited for the task?
Depends on the task :-) To match exactly all Latin characters and their accented versions, the Unicode ranges probably provide the best solution. They might be extended to all non-whitespace characters, which could be done using the \S character class.
I'm forcing a field in a UI to match the format: last_name, first_name (last [comma space] first)
The most basic problem I'm seeing here are not diacritics, but whitespaces. There are a few names that consist of multiple words, e.g. for titles. So you should go with the most generic, that is allowing everything but the comma that distinguishes first from last name:
/[^,]+,\s[^,]+/
But your second solution with the . character class is just as fine, you only might need to care about multiple commata then.
The XRegExp library has a plugin named Unicode that helps solve tasks like this.
<script src="xregexp.js"></script>
<script src="addons/unicode/unicode-base.js"></script>
<script>
var unicodeWord = XRegExp("^\\p{L}+$");
unicodeWord.test("Русский"); // true
unicodeWord.test("日本語"); // true
unicodeWord.test("العربية"); // true
</script>
/^[\pL\pM\p{Zs}.-]+$/u
Explanation:
\pL - matches any kind of letter from any language
\pM - matches a character intended to be combined with another character (e.g. accents, umlauts, enclosing boxes, etc.)
\p{Zs} - matches a whitespace character that is invisible, but does take up space
u - Pattern and subject strings are treated as UTF-8
Unlike other proposed regex (such as [A-Za-zÀ-ÖØ-öø-ÿ]), this will work with all language specific characters, e.g. Šš is matched by this rule, but not matched by others on this page.
Unfortunately, natively JavaScript does not support these classes. However, you can use xregexp, e.g.
const XRegExp = require('xregexp');
const isInputRealHumanName = (input: string): boolean => {
return XRegExp('^[\\pL\\pM-]+ [\\pL\\pM-]+$', 'u').test(input);
};
You can use this:
/^[a-zA-ZÀ-ÖØ-öø-ÿ]+$/
You can use this:
^([a-zA-Z]|[à-ú]|[À-Ú])+$
It will match every word with accented characters or not.
You can remove the diacritics from alphabets by using:
var str = "résumé"
str.normalize('NFD').replace(/[\u0300-\u036f]/g, '') // returns resume
It will remove all the diacritical marks, and then perform your regex on it.
Reference:
Searching and sorting text with diacritical marks in JavaScript
From Wikipedia: Basic Latin
For Latin letters, I use
/^[A-zÀ-ÖØ-öø-ÿ]+$/
It avoids hyphens and specials characters.
My context is slightly different and limited to French: I want to search text by allowing a mistake of accents.
For example, I want to find "maîtrisée", but the text to be searched is "... maitrisee ...". So, I used the regular expression /ma[i|î|ï]tris[e|é|è|ê|ë]/ in JavaScript.
In the expression, the '[' and ']' define a set of characters, and the '|' is an OR condition.
This page gives a list of accented characters: Diacritiques utilisés en français

How to match text, numbers, and white space characters for all languages in Javascript using XRegexp

Context:
I am improving a custom token parsing engine, and want to support characters, numbers and space characters in different languages.
Currently, This works with English characters and numbers with the following regex
var pattern = /\{\{someText\(?(\d+)?\|?([\w\d\s%]+)?\)?[\s\S]+\}\}/;
// this will extract the number and text in a token like
'{{someText(20|Hello World)}}'.match(pattern);
//output
[20, 'Hello World']
But the above regex failed to parse characters in other languages:
'{{someText(20|abcdèfg)}}'.match(pattern);
//output
[20, 'abcd']
Regex that I have tried:
I tried using XRegexp with the below regex, but looks like it's not working as I expected.
var pattern = XRegExp(/\{\{customText\(?(\d+)?\|?([[\p{L}\p{N}_]\p{Nd}[\p{Z}\h\v]%]+)?\)?[\s\S]+\}\}/);
'{{someText(20|abcdèfg)}}'.match(pattern);
//output
[20, undefined]
For the new engine, I want to support characters in other languages as well. So that the text in
'{{someText(20|abcdèfg)}}'.match(pattern);
will produce an output
[20, abcdèfg]
The format of this token is always like {{someText(number|'The actual text')}}
You should try this out:
\{\{someText\(?(\d+)?\|?([^\n\r|]+)?\)?\}\}
As seen here, at regex101.com
Explanation -
According to the Microsoft Docs,
If ECMAScript-compliant behavior is specified, \w is equivalent to [a-zA-Z_0-9]
So, \w would naturally match any English character, not the ones with an accent.
A good workaround is to use [^\n\r|] instead of [\w\d\s%], so that it matches every character, EXCEPT newlines and the pipe | symbol (for obvious reasons).
Also, you included a [\s\S]+ for some reason, which would basically match every space and non-space character (that is, every character in existence). I removed that so you could match multiple occurrences of the pattern, even on new lines :)

Firefox throws 'invalid identity escape in regular expression' when using Perl tokens with 'u' flag [duplicate]

What is the easiest way to match non-ASCII characters in a regex? I would like to match all words individually in an input string, but the language may not be English, so I will need to match things like ü, ö, ß, and ñ. Also, this is in Javascript/jQuery, so any solution will need to apply to that.
This should do it:
[^\x00-\x7F]+
It matches any character which is not contained in the ASCII character set (0-127, i.e. 0x0 to 0x7F).
You can do the same thing with Unicode:
[^\u0000-\u007F]+
For unicode you can look at this 2 resources:
Code charts list of Unicode ranges
This tool to create a regex filtered by Unicode block.
var words_in_text = function (text) {
var regex = /([\u0041-\u005A\u0061-\u007A\u00AA\u00B5\u00BA\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u08A0\u08A2-\u08AC\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097F\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C33\u0C35-\u0C39\u0C3D\u0C58\u0C59\u0C60\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D60\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F4\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191C\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19C1-\u19C7\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2183\u2184\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005\u3006\u3031-\u3035\u303B\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FCC\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA66E\uA67F-\uA697\uA6A0-\uA6E5\uA717-\uA71F\uA722-\uA788\uA78B-\uA78E\uA790-\uA793\uA7A0-\uA7AA\uA7F8-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA80-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uABC0-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]+)/g;
return text.match(regex);
};
words_in_text('Düsseldorf, Köln, Москва, 北京市, إسرائيل !##$');
// returns array ["Düsseldorf", "Köln", "Москва", "北京市", "إسرائيل"]
This regex will match all words in the text of any language...
Unicode Property Escapes are among the features of ES2018.
Basic Usage
With Unicode Property Escapes, you can match a letter from any language with the following simple regular expression:
/\p{Letter}/u
Or with the shorthand, even terser:
/\p{L}/u
Matching Words
Regarding the question's concrete use case (matching words), note that you can use Unicode Property Escapes in character classes, making it easy to match letters together with other word-characters like hyphens:
/[\p{L}-]/u
Stitching it all together, you could match words of all[1] languages with this beautifully short RegEx:
/[\p{L}-]+/ug
Example (shamelessly plugged from the answer above):
'Düsseldorf, Köln, Москва, 北京市, إسرائيل !##$'.match(/[\p{L}-]+/ug)
// ["Düsseldorf", "Köln", "Москва", "北京市", "إسرائيل"]
[1] Note that I'm not an expert on languages. You may still want to do your own research regarding other characters that might be parts of words besides letters and hyphens.
Browser Support
This feature is available in all major evergreen browsers.
Transpiling
If support for older browsers is needed, Unicode Property Escapes can be transpiled to ES5 with a tool called regexpu. There's an online demo available here. As you can see in the demo, you can in fact match non-latin letters today with the following (horribly long) ES5 regular expression:
/(?:[A-Za-z\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052F\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u0860-\u086A\u08A0-\u08B4\u08B6-\u08BD\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0980\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u09FC\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0AF9\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C39\u0C3D\u0C58-\u0C5A\u0C60\u0C61\u0C80\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D54-\u0D56\u0D5F-\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F5\u13F8-\u13FD\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16F1-\u16F8\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1877\u1880-\u1884\u1887-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191E\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19B0-\u19C9\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1C80-\u1C88\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2183\u2184\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005\u3006\u3031-\u3035\u303B\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312E\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FEA\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA66E\uA67F-\uA69D\uA6A0-\uA6E5\uA717-\uA71F\uA722-\uA788\uA78B-\uA7AE\uA7B0-\uA7B7\uA7F7-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA8FD\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uA9E0-\uA9E4\uA9E6-\uA9EF\uA9FA-\uA9FE\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA7E-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uAB30-\uAB5A\uAB5C-\uAB65\uAB70-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]|\uD800[\uDC00-\uDC0B\uDC0D-\uDC26\uDC28-\uDC3A\uDC3C\uDC3D\uDC3F-\uDC4D\uDC50-\uDC5D\uDC80-\uDCFA\uDE80-\uDE9C\uDEA0-\uDED0\uDF00-\uDF1F\uDF2D-\uDF40\uDF42-\uDF49\uDF50-\uDF75\uDF80-\uDF9D\uDFA0-\uDFC3\uDFC8-\uDFCF]|\uD801[\uDC00-\uDC9D\uDCB0-\uDCD3\uDCD8-\uDCFB\uDD00-\uDD27\uDD30-\uDD63\uDE00-\uDF36\uDF40-\uDF55\uDF60-\uDF67]|\uD802[\uDC00-\uDC05\uDC08\uDC0A-\uDC35\uDC37\uDC38\uDC3C\uDC3F-\uDC55\uDC60-\uDC76\uDC80-\uDC9E\uDCE0-\uDCF2\uDCF4\uDCF5\uDD00-\uDD15\uDD20-\uDD39\uDD80-\uDDB7\uDDBE\uDDBF\uDE00\uDE10-\uDE13\uDE15-\uDE17\uDE19-\uDE33\uDE60-\uDE7C\uDE80-\uDE9C\uDEC0-\uDEC7\uDEC9-\uDEE4\uDF00-\uDF35\uDF40-\uDF55\uDF60-\uDF72\uDF80-\uDF91]|\uD803[\uDC00-\uDC48\uDC80-\uDCB2\uDCC0-\uDCF2]|\uD804[\uDC03-\uDC37\uDC83-\uDCAF\uDCD0-\uDCE8\uDD03-\uDD26\uDD50-\uDD72\uDD76\uDD83-\uDDB2\uDDC1-\uDDC4\uDDDA\uDDDC\uDE00-\uDE11\uDE13-\uDE2B\uDE80-\uDE86\uDE88\uDE8A-\uDE8D\uDE8F-\uDE9D\uDE9F-\uDEA8\uDEB0-\uDEDE\uDF05-\uDF0C\uDF0F\uDF10\uDF13-\uDF28\uDF2A-\uDF30\uDF32\uDF33\uDF35-\uDF39\uDF3D\uDF50\uDF5D-\uDF61]|\uD805[\uDC00-\uDC34\uDC47-\uDC4A\uDC80-\uDCAF\uDCC4\uDCC5\uDCC7\uDD80-\uDDAE\uDDD8-\uDDDB\uDE00-\uDE2F\uDE44\uDE80-\uDEAA\uDF00-\uDF19]|\uD806[\uDCA0-\uDCDF\uDCFF\uDE00\uDE0B-\uDE32\uDE3A\uDE50\uDE5C-\uDE83\uDE86-\uDE89\uDEC0-\uDEF8]|\uD807[\uDC00-\uDC08\uDC0A-\uDC2E\uDC40\uDC72-\uDC8F\uDD00-\uDD06\uDD08\uDD09\uDD0B-\uDD30\uDD46]|\uD808[\uDC00-\uDF99]|\uD809[\uDC80-\uDD43]|[\uD80C\uD81C-\uD820\uD840-\uD868\uD86A-\uD86C\uD86F-\uD872\uD874-\uD879][\uDC00-\uDFFF]|\uD80D[\uDC00-\uDC2E]|\uD811[\uDC00-\uDE46]|\uD81A[\uDC00-\uDE38\uDE40-\uDE5E\uDED0-\uDEED\uDF00-\uDF2F\uDF40-\uDF43\uDF63-\uDF77\uDF7D-\uDF8F]|\uD81B[\uDF00-\uDF44\uDF50\uDF93-\uDF9F\uDFE0\uDFE1]|\uD821[\uDC00-\uDFEC]|\uD822[\uDC00-\uDEF2]|\uD82C[\uDC00-\uDD1E\uDD70-\uDEFB]|\uD82F[\uDC00-\uDC6A\uDC70-\uDC7C\uDC80-\uDC88\uDC90-\uDC99]|\uD835[\uDC00-\uDC54\uDC56-\uDC9C\uDC9E\uDC9F\uDCA2\uDCA5\uDCA6\uDCA9-\uDCAC\uDCAE-\uDCB9\uDCBB\uDCBD-\uDCC3\uDCC5-\uDD05\uDD07-\uDD0A\uDD0D-\uDD14\uDD16-\uDD1C\uDD1E-\uDD39\uDD3B-\uDD3E\uDD40-\uDD44\uDD46\uDD4A-\uDD50\uDD52-\uDEA5\uDEA8-\uDEC0\uDEC2-\uDEDA\uDEDC-\uDEFA\uDEFC-\uDF14\uDF16-\uDF34\uDF36-\uDF4E\uDF50-\uDF6E\uDF70-\uDF88\uDF8A-\uDFA8\uDFAA-\uDFC2\uDFC4-\uDFCB]|\uD83A[\uDC00-\uDCC4\uDD00-\uDD43]|\uD83B[\uDE00-\uDE03\uDE05-\uDE1F\uDE21\uDE22\uDE24\uDE27\uDE29-\uDE32\uDE34-\uDE37\uDE39\uDE3B\uDE42\uDE47\uDE49\uDE4B\uDE4D-\uDE4F\uDE51\uDE52\uDE54\uDE57\uDE59\uDE5B\uDE5D\uDE5F\uDE61\uDE62\uDE64\uDE67-\uDE6A\uDE6C-\uDE72\uDE74-\uDE77\uDE79-\uDE7C\uDE7E\uDE80-\uDE89\uDE8B-\uDE9B\uDEA1-\uDEA3\uDEA5-\uDEA9\uDEAB-\uDEBB]|\uD869[\uDC00-\uDED6\uDF00-\uDFFF]|\uD86D[\uDC00-\uDF34\uDF40-\uDFFF]|\uD86E[\uDC00-\uDC1D\uDC20-\uDFFF]|\uD873[\uDC00-\uDEA1\uDEB0-\uDFFF]|\uD87A[\uDC00-\uDFE0]|\uD87E[\uDC00-\uDE1D])/
If you're using Babel, there's also a regexpu-powered plugin for that (Babel v6 plugin, Babel v7 plugin).
The situation with regexes, Unicode, and Javascript sucks. It's ridiculous that programmers should have to rely on external libraries to recognize that "Αλφα" is a word, or even that "é" is a letter.
But so it goes.
This guy has written a good library for handling Unicode in Javascript Regexes:
http://blog.stevenlevithan.com/archives/javascript-regex-and-unicode
The Unicode stuff is a plugin to this regex library:
http://xregexp.com/
Here's a post about the Unicode extension:
http://blog.stevenlevithan.com/archives/xregexp-unicode-plugin
And the extension page itself:
http://xregexp.com/plugins/
Great work but it still bums me out that Javascript is so backwards in this regard.
(He wrote a book for O'Reilly about the topic so it's quite possible that he knows what he's talking about.)
The way he implemented it is by adding tables of characters with certain properties. Then, when you contruct a regex with his library, \p{charclass} gets replaced with [allthecharactersintheclass].
The answer given by Jeremy Ruten is great, but I think it's not exactly what Paul Wicks was searching for. If I understand correctly Paul asked about expression to match non-english words like können or móc. Jeremy's regex matches only non-english letters, so there's need for small improvement:
([^\x00-\x7F]|\w)+
or
([^\u0000-\u007F]|\w)+
This [^\x00-\x7F] and this [^\u0000-\u007F] parts allow regullar expression to match non-english letters.
This (|) is logical or and \w is english letter, so ([^\u0000-\u007F]|\w) will match single english or non-english letter.
+ at the end of the expression means it could be repeated, so the whole expression allows all english or non-english letters to match.
Here you can test the first expression with various strings and here is the second.
You do the same way as any other character matching, but you use \uXXXX where XXXX is the unicode number of the character.
Look at:
http://unicode.org/charts/charindex.html
http://unicode.org/charts/
http://www.decodeunicode.org/
All Unicode-enabled Regex flavours should have a special character class like \w that match any Unicode letter. Take a look at your specific flavour here.
I had a problem with \p working as expected, so I just used a different strategy like:
([^\t]+)\t
Find anything that is not a tab character until the next tab character... obviously this depends on your search source, but you get the idea. Now I don't have to figure out what unicode characters work and don't work etc.

Concrete JavaScript regular expression for accented characters (diacritics)

I've looked on Stack Overflow (replacing characters.. eh, how JavaScript doesn't follow the Unicode standard concerning RegExp, etc.) and haven't really found a concrete answer to the question "How can JavaScript match accented characters (those with diacritical marks)?"
I'm forcing a field in a UI to match the format: last_name, first_name (last [comma space] first), and I want to provide support for diacritics, but evidently in JavaScript it's a bit more difficult than other languages/platforms.
This was my original version, until I wanted to add diacritic support:
/^[a-zA-Z]+,\s[a-zA-Z]+$/
Currently I'm debating one of three methods to add support, all of which I have tested and work (at least to some extent, I don't really know what the "extent" is of the second approach). Here they are:
Explicitly listing all accented characters that I would want to accept as valid (lame and overly-complicated):
var accentedCharacters = "àèìòùÀÈÌÒÙáéíóúýÁÉÍÓÚÝâêîôûÂÊÎÔÛãñõÃÑÕäëïöüÿÄËÏÖÜŸçÇßØøÅåÆæœ";
// Build the full regex
var regex = "^[a-zA-Z" + accentedCharacters + "]+,\\s[a-zA-Z" + accentedCharacters + "]+$";
// Create a RegExp from the string version
regexCompiled = new RegExp(regex);
// regexCompiled = /^[a-zA-ZàèìòùÀÈÌÒÙáéíóúýÁÉÍÓÚÝâêîôûÂÊÎÔÛãñõÃÑÕäëïöüÿÄËÏÖÜŸçÇßØøÅåÆæœ]+,\s[a-zA-ZàèìòùÀÈÌÒÙáéíóúýÁÉÍÓÚÝâêîôûÂÊÎÔÛãñõÃÑÕäëïöüÿÄËÏÖÜŸçÇßØøÅåÆæœ]+$/
This correctly matches a last/first name with any of the supported accented characters in accentedCharacters.
My other approach was to use the . character class, to have a simpler expression:
var regex = /^.+,\s.+$/;
This would match for just about anything, at least in the form of: something, something. That's alright I suppose...
The last approach, which I just found might be simpler...
/^[a-zA-Z\u00C0-\u017F]+,\s[a-zA-Z\u00C0-\u017F]+$/
It matches a range of Unicode characters - tested and working, though I didn't try anything crazy, just the normal stuff I see in our language department for faculty member names.
Here are my concerns:
The first solution is far too limiting, and sloppy and convoluted at that. It would need to be changed if I forgot a character or two, and that's just not very practical.
The second solution is better, concise, but it probably matches far more than it actually should. I couldn't find any real documentation on exactly what . matches, just the generalization of "any character except the newline character" (from a table on the MDN).
The third solution seems the be the most precise, but are there any gotchas? I'm not very familiar with Unicode, at least in practice, but looking at a code table/continuation of that table, \u00C0-\u017F seems to be pretty solid, at least for my expected input.
Faculty won't be submitting forms with their names in their native language (e.g., Arabic, Chinese, Japanese, etc.), so I don't have to worry about out-of-Latin-character-set characters
Which of these three approaches is most suited for the task? Or are there better solutions?
The easier way to accept all accents is this:
[A-zÀ-ú] // accepts lowercase and uppercase characters
[A-zÀ-ÿ] // as above, but including letters with an umlaut (includes [ ] ^ \ × ÷)
[A-Za-zÀ-ÿ] // as above but not including [ ] ^ \
[A-Za-zÀ-ÖØ-öø-ÿ] // as above, but not including [ ] ^ \ × ÷
See Unicode Character Table for characters listed in numeric order.
The accented Latin range \u00C0-\u017F was not quite enough for my database of names, so I extended the regex to
[a-zA-Z\u00C0-\u024F]
[a-zA-Z\u00C0-\u024F\u1E00-\u1EFF] // includes even more Latin chars
I added these code blocks (\u00C0-\u024F includes three adjacent blocks at once):
\u00C0-\u00FF Latin-1 Supplement
\u0100-\u017F Latin Extended-A
\u0180-\u024F Latin Extended-B
\u1E00-\u1EFF Latin Extended Additional
Note that \u00C0-\u00FF is actually only a part of Latin-1 Supplement. It skips unprintable control signals and all symbols except for the awkwardly-placed multiply × \u00D7 and divide ÷ \u00F7.
[a-zA-Z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u024F] // exclude ×÷
If you need more code points, you can find more ranges on Wikipedia's List of Unicode characters. For example, you could also add Latin Extended-C, D, and E, but I left them out because only historians seem interested in them now, and the D and E sets don't even render correctly in my browser.
The original regex stopping at \u017F borked on the name "Șenol". According to FontSpace's Unicode Analyzer, that first character is \u0218, LATIN CAPITAL LETTER S WITH COMMA BELOW. (Yeah, it's usually spelled with a cedilla-S \u015E, "Şenol." But I'm not flying to Turkey to go tell him, "You're spelling your name wrong!")
Which of these three approaches is most suited for the task?
Depends on the task :-) To match exactly all Latin characters and their accented versions, the Unicode ranges probably provide the best solution. They might be extended to all non-whitespace characters, which could be done using the \S character class.
I'm forcing a field in a UI to match the format: last_name, first_name (last [comma space] first)
The most basic problem I'm seeing here are not diacritics, but whitespaces. There are a few names that consist of multiple words, e.g. for titles. So you should go with the most generic, that is allowing everything but the comma that distinguishes first from last name:
/[^,]+,\s[^,]+/
But your second solution with the . character class is just as fine, you only might need to care about multiple commata then.
The XRegExp library has a plugin named Unicode that helps solve tasks like this.
<script src="xregexp.js"></script>
<script src="addons/unicode/unicode-base.js"></script>
<script>
var unicodeWord = XRegExp("^\\p{L}+$");
unicodeWord.test("Русский"); // true
unicodeWord.test("日本語"); // true
unicodeWord.test("العربية"); // true
</script>
/^[\pL\pM\p{Zs}.-]+$/u
Explanation:
\pL - matches any kind of letter from any language
\pM - matches a character intended to be combined with another character (e.g. accents, umlauts, enclosing boxes, etc.)
\p{Zs} - matches a whitespace character that is invisible, but does take up space
u - Pattern and subject strings are treated as UTF-8
Unlike other proposed regex (such as [A-Za-zÀ-ÖØ-öø-ÿ]), this will work with all language specific characters, e.g. Šš is matched by this rule, but not matched by others on this page.
Unfortunately, natively JavaScript does not support these classes. However, you can use xregexp, e.g.
const XRegExp = require('xregexp');
const isInputRealHumanName = (input: string): boolean => {
return XRegExp('^[\\pL\\pM-]+ [\\pL\\pM-]+$', 'u').test(input);
};
You can use this:
/^[a-zA-ZÀ-ÖØ-öø-ÿ]+$/
You can use this:
^([a-zA-Z]|[à-ú]|[À-Ú])+$
It will match every word with accented characters or not.
You can remove the diacritics from alphabets by using:
var str = "résumé"
str.normalize('NFD').replace(/[\u0300-\u036f]/g, '') // returns resume
It will remove all the diacritical marks, and then perform your regex on it.
Reference:
Searching and sorting text with diacritical marks in JavaScript
From Wikipedia: Basic Latin
For Latin letters, I use
/^[A-zÀ-ÖØ-öø-ÿ]+$/
It avoids hyphens and specials characters.
My context is slightly different and limited to French: I want to search text by allowing a mistake of accents.
For example, I want to find "maîtrisée", but the text to be searched is "... maitrisee ...". So, I used the regular expression /ma[i|î|ï]tris[e|é|è|ê|ë]/ in JavaScript.
In the expression, the '[' and ']' define a set of characters, and the '|' is an OR condition.
This page gives a list of accented characters: Diacritiques utilisés en français

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