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Given a string "translateX(-50%) scale(1.2)" with N transform functions
1) How can I match the names ["translateX", "scale"]?
2) How can I match the values ["-50%", "1.2"]?
If you absolutely must use regular expression to do this, you can use the exec() method in a loop, pushing the match result of the captured group(s) to the desired arrays of choice.
var str = 'translateX(-50%) scale(1.2)'
var re = /(\w+)\(([^)]*)\)/g,
names = [], vals = [];
while (m = re.exec(str)) {
names.push(m[1]), vals.push(m[2]);
}
console.log(names) //=> [ 'translateX', 'scale' ]
console.log(vals) //=> [ '-50%', '1.2' ]
The regular expression uses two capture groups, the first matches/captures word characters only, the second uses negation which will match any character except ) "zero or more" times.
Try something like (\w+)\((.+?)\):
(\w+): Match the regular expression below and capture its match into backreference number 1
\w+: Match a single character that is a “word character” (letters, digits, and underscores)
+: Between one and unlimited times, as many times as possible, giving back as needed (greedy)
\(: Match the character “(” literally
(.+?): Match the regular expression below and capture its match into backreference number 2
.+?: Match any single character that is not a line break character
+?: Between one and unlimited times, as few times as possible, expanding as needed (lazy)
\): Match the character “)” literally
var str = "translateX(-50%) scale(1.2)",
regex = /(\w+)\((.+?)\)/g,
match, names = [], values = [];
while(match = regex.exec(str)) {
names.push(match[1]);
values.push(match[2]);
}
Related
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How could I get the specific substring between 'Y___(string i want to get)___N'？
For example：
"Y___INT_GET_ERROR_CONFIGS___N"
"INT_GET_ERROR_CONFIGS"
You can get everything inside by Y___(.*?)___N, you can use matchAll to get all instance that matches this case, and you can loop through and get the group value.
const str = `Y___INT_GET_ERROR_CONFIGS___N
INT_GET_ERROR_CONFIGS Y___INT_GET_ERROR_SOMETHING___N`
const result = str.matchAll(/Y___(.*?)___N/g);
for (match of result) {
console.log(match[1])
}
If it's just the first occurrence you wish you match, then:
'Y___(string you want to get)___N'.match(/(?<=Y___).+(?=___N)/)
Result:
"(string you want to get)"
If you want all such occurrences to be returned, then use the g flag:
`Y___(string you want to get)___N
.
.
.
Y___(second string you want)___N`.match(/(?<=Y___).+(?=___N)/g)
Result:
["(string you want to get)", "(second string you want)"]
Explanation:
(?<=Y___): A positive lookbehind stipulates that matches will be preceded by the contents of the lookbehind, namely "Y___". The contents of the lookbehind does not form part of the match result, and also does not consume characters during matching.
.+: Matches at least one instance of any character, but will match as many as possible.
(?=___N): A positive lookahead stipulates that matches will be proceeded by the contents of the lookahead, namely "___N". The contents of the lookahead does not form part of the match result, nor does it consume characters during matching.
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I have tried many regex expressions but unable to get the desired output.
My string is
Ms.Evalyn J Hobbs AND Mr.Jan K Hir sch AND Ms.Gale D Bannister 3611
I need to extract the digits group which come after Mr or Mrs that is 3611
Try Regex: (?:Ms|Mr|Mrs).*?(\d+) and get Group 1 value
Demo
Another way to capture digits in a group after Ms., Mr. Ms. (or maybe Miss.) could be:
\bM(?:rs?|s|iss)\.[^\d]+(\d+)
That would match
A word boundary \b to make sure it is not part of a larger match and then M
An alternation (?:rs?|s|iss)\. that would match one of the variants followed by a dot.
Match not a digit using a negated character class [^\d]+
At the end capture one or more digits in a capturing group (\d+)
const regex = /\bM(?:rs?|s|iss)\.[^\d]+(\d+)/g;
const str = "Ms.Evalyn 33 J Hobbs AND Mr.Jan K Hir 55 years Mr. sch AND Ms.Gale D Bannister 3611";
while ((m = regex.exec(str)) !== null) {
if (m.index === regex.lastIndex) {
regex.lastIndex++;
}
console.log(m[1]);
}
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I need to create an expression that fit this requirements :
The string must be composed by 3 substring
The first substring accept 0-9a-zA-Z, the minimum length is 1 and there is notte max length
The second substring must be " - "
The last have The first's one same condition
Total maximum string length must be 28 chars
It is possible to accomplish this requirement with Regex?
Following regex should work fine:
/(?=^.{3,28}$)[^\W_]+\-[^\W_]+/
var array = [
"123456790-123456789012345678",
"123456790-1234567890123456789",
"adsd-dsds"
];
var re = /(?=^.{3,28}$)[^\W_]+\-[^\W_]+/;
array.forEach(e => console.log(re.test(e) ? e.match(re)[0]: "match failed"));
Breakdown shamelessly copied from regex101.com:
Positive Lookahead (?=^.{3,28}$)
^ asserts position at start of a line
.{3,28} matches any character (except for line terminators)
{3,28} Quantifier — Matches between 3 and 28 times, as many times as possible, giving back as needed (greedy)
$ asserts position at the end of a line
Match a single character not present in the list below [^\W_]+
+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
\W matches any non-word character (equal to [^a-zA-Z0-9_])
_ matches the character _ literally (case sensitive)
\- matches the character - literally (case sensitive)
Match a single character not present in the list below [^\W_]+
+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
\W matches any non-word character (equal to [^a-zA-Z0-9_])
_ matches the character _ literally (case sensitive)
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How in javascript to make regex to recognize and extract integer numbers for coordinates which have format like
( number1, number2 )
between ( and number1 and , and number2 and ) can be arbitrary number of whitespaces (user are going to enter coordinates so I don't want to force strict format without whitespaces)
(\d+,\d+)
what to add to this so it works ?
There are a few choices, pending your actual input.
To match all "whitespace characters" (space, tab, carriage return, newline and form feed), you can use the \s shorthand approach. If you want a number, in this case \d+, to be surrounded by "0 or more" of these, you would use:
\s*\d+\s*
In your full pattern:
\( # opening parentheses
\s*\d+\s*, # first number followed by a comma
\s*\d+\s* # second number
\) # closing parentheses
Note: The parentheses are escaped here as they're special characters in a regular expression pattern.
Now, if you don't want to match "all whitespace" and were only interested in plain spaces, for example, you could use a matching character set of [ ] (i.e. a space between two brackets). In the pattern from above:
\(
[ ]*\d+[ ]*,
[ ]*\d+[ ]*
\)
Not really sure how you want to use the matches, I'm assuming you want the numbers returned individually so in that case, you can use the following:
var str = '(1, 2)';
var matches = str.match(/\(\s*(\d+)\s*,\s*(\d+)\s*\)/);
if (matches) {
var firstNumber = matches[1];
var secondNumber = matches[2];
// do stuffs
}
Note: In the pattern I used here, I've wrapped the \d+s in parentheses; this will "capture" those values in to groups which are then accessible by their "group index". So, the first (\d+) will be available in matches[1] and the second will be available in matches[2].
Try this regex: \(\s*\d+\s*,\s*\d+\s*\).
Fiddle
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I need a regular expression for a string that
starts with Alphabets (no number)
max Length 8
No special characters or space.
string can have number or _ except for starting character.
This would work:
/^[a-z][a-z0-9_]{0,7}$/i
For example,
/^[a-z][a-z0-9_]{0,7}$/i.test('a1234567'); // true
/^[a-z][a-z0-9_]{0,7}$/i.test('01234567'); // false
The \w shorthand is for all letters, numbers and underscores. [A-Za-z] is overkill, the /i flag will get you all letters, case insensitive.
Therefore, a super simple regex for what you need is:
/^[a-z]\w{0,7}$/i
/^[a-z]\w{0,7}$/i.test("a1234567");
> true
/^[a-z]\w{0,7}$/i.test("a12345697");
> false
/^[a-z]\w{0,7}$/i.test("01234567");
> false
Try this out:
/^[A-Za-z]{1}[a-zA-Z0-9_]{0,7}$/
Try this one:
/^[a-zA-Z][0-9a-zA-Z_]{0,7}$/
This requires an alpha start character, and optionally allows up to 7 more characters which are either alphanumeric or underscore.
EDIT: Thanks, Jesse for the correction.
And another version with lookaheads :)
if (subject.match(/^(?=[a-z]\w{0,7}$)/i)) {
// Successful match
}
Explanation :
"^" + // Assert position at the beginning of the string
"(?=" + // Assert that the regex below can be matched, starting at this position (positive lookahead)
"[a-z]" + // Match a single character in the range between “a” and “z”
"\\w" + // Match a single character that is a “word character” (letters, digits, etc.)
"{0,7}" + // Between zero and 7 times, as many times as possible, giving back as needed (greedy)
"$" + // Assert position at the end of the string (or before the line break at the end of the string, if any)
")"