JavaScript Match Using regexp - javascript

I'm trying to extract some data from a large string and I was wondering if it is possible to use regexp. Currently, I'm using javascript. For example:
This is some [example] text for my javascript [regexp] [lack] of knowledge.
With this string, I would like to generate a JSON array with the texts that are between the square brackets.
example, regexp, lack
I hope someone can help me do this in a simple way so I can understand how it works. Thank you in advance for your help. Daniel!

var str = "This is some [example] text for my javascript [regexp] [lack] of knowledge."
var regex = /\[(.*?)\]/g, result, indices = [];
while ( (result = regex.exec(str)) ) {
indices.push(result[1]);
}

var text = 'some [example] text for my javascript [regexp] [lack] of knowledge.';
text.match(/\[(.*?)\]/g).map(function(m) {
return m.substr(1, m.length - 2);
})
// => ["example", "regexp", "lack"]

http://jsfiddle.net/mE7EQ/
I wrote one up real quick, if you have any questions about it, let me know!
var a = 'This is some [example] text for my javascript [regexp] [lack] of knowledge.'
var results = a.match(/\[\w*\]/g);
alert(results[0] + ' ' + results[1] + ' ' + results[2]);

Related

Javascript - Get substring that comes after "string1" and before "string2"

When making a fetch to a certain URL, I am getting an HTML page in the format of text as I wanted.
Inside of it, there are plenty of id=(...)" and I require one of them
So I am asking, how could I get an array with all the strings that come after "id=" and before the " " "?
I made some tries such as :
var startsWith = "id="
var endsWith = "\""
var between = fullString.slice(fullString.indexOf(startsWith), fullstring.indexOf(endsWith))
but couldn't get it to work.
Any suggestions are welcome
you can use the following regex: /id=\"(.*?)\"/gmi.
The code will be as such:
fullString.match(/id=\"(.*?)\"/gmi)
The result will be an array of id="your id"
and then you can do the following:
var between = fullString.match(/id=\"(.*?)\"/gmi).map(str => str.substr(str.indexOf('id=\"') + 'id=\"'.length).slice(0, -1))
Why you dont use a plugin like jquery? Please refer to this example:
var fullString = "<y>your cool html</y>";
var $html = $(fullString);
var stuffInside = $(html).find('#yourId');
console.warn('stuffInside:', stuffInside.html());

Javascript cut string by begin and end and store in array

I need a algorithm which is doing something like this:
var example = "Hello $$user$$ your real name is $$realname$$. Have a good day"
Output --> ["Hello ", "$$user$$", " your real name is ", "$$realname$$", ". Have a good day"]
Hence, split the part by a selected character and put them together in a string array. Can someone help me out?
I'm looking for a solution with JavaScript/jQuery
It seems you want to split by pattern $$...$$; You could use /(\$\$.*?\$\$)/; To keep the pattern in the result, you can make it a capture group, and also make it lazy (?) so that it will split with the shortest length pattern matched:
example.split(/(\$\$.*?\$\$)/)
#[ 'Hello ',
# '$$user$$',
# ' your real name is ',
# '$$realname$$',
# '. Have a good day' ]
Yes, this is possible with JavaScript itself... Slightly tricky, but yes.
var strings = [], tokens = [];
var str = "Hello $$user$$ your real name is $$realname$$. Have a good day".replace(/\$\$(.*?)\$\$/g, "\$\$TOKEN$1\$\$").split("$");
for (var i = 0; i < str.length; i++) {
if (str[i].indexOf("TOKEN") === 0) {
// This is a token.
tokens.push(str[i].replace("TOKEN", ""));
} else {
strings.push(str[i]);
}
}
str = str.map(function (v) {
if (v.indexOf("TOKEN") === 0)
return "$$" + v.replace("TOKEN", "") + "$$";
return v;
});
console.log(str);
console.log(strings);
console.log(tokens);
The above code will split everything into tokens. And on top of it, it also separates the strings and tokens out. The above one gives as per your requirement:
[
"Hello ",
"$$user$$",
" your real name is ",
"$$realname$$",
". Have a good day"
]
Kindly note, there's nothing like {value, value}, there's only [value, value].
String.split()
The split() method splits a String object into an array of strings by separating the string into substrings.
var example = "Hello $$user$$ your real name is $$realname$$. Have a good day";
var exSplit = example.split("$$");
var userIdx = exSplit.indexOf("user");
var nameIdx = exSplit.indexOf("realname");
document.querySelector(".user").innerHTML = exSplit[userIdx];
document.querySelector(".name").innerHTML = exSplit[nameIdx];
<div class="user"></div>
<div class="name"></div>
Though, if I may suggest, variables can handle this type of operation without all of the hassle.

Javascript splitting string in to two parts number and text safely

I was wondering if there is a safe way (if the data is coming from users) to get the string and the number separated - for example "something-55", "something-124", "something-1291293"
I would want:
something and
55
something and
124
something and
1291293
I mean by a 'safe way' is to be certain I am getting only the number on the end.. if the data is coming from the users "something" could be anything some-thing-55 for example..
I'm looking for a robust way.
try this, working.
var string = 'something-456';
var array = string.split('-');
for (var i = 0;i<array.length;i++){
var number = parseFloat(array[i]);
if(!isNaN(number)){
var myNumber = number;
var mySomething = array[i - 1];
console.log('myNumber= ' + myNumber);
console.log('mySomething= ' + mySomething);
}
}
Can you try this?
var input='whatever-you-want-to-parse-324';
var sections=input.split(/[\w]+-/);
alert(sections[sections.length-1]);
You can use substr along with lastIndexOf:
var str = "something-somethingelse-55",
text = str.substr(0, str.lastIndexOf('-')),
number = str.substr(str.lastIndexOf('-') + 1);
console.log(text + " and " + number);
Fiddle Demo
All though it's a tad late, this would be the most restrictive solution:
var regex = /^([-\w])+?-(\d+)$/,
text = "foo-123",
match = test.match(regex);
You will get a match object back with the following values:
[ "foo-123", "foo", "123" ]
It's a very strict match so that " foo-123" and "foo-123 " would not match, and it requires the string to end in one or more digits.

Change occurrences of sum(something) to something_sum

Admittedly I'm terrible with RegEx and pattern replacements, so I'm wondering if anyone can help me out with this one as I've been trying now for a few hours and in the process of pulling my hair out.
Examples:
sum(Sales) needs to be converted to Sales_sum
max(Sales) needs to be converted to Sales_max
min(Revenue) needs to be converted to Revenue_min
The only available prefixed words will be sum, min, max, avg, xcount - not sure if this makes a difference in the solution.
Hopefully that's enough information to kind of show what I'm trying to do. Is this possible via RegEx?
Thanks in advance.
There are a few possible ways, for example :
var str = "min(Revenue)";
var arr = str.match(/([^(]+)\(([^)]+)/);
var result = arr[2]+'_'+arr[1];
result is then "Revenue_min".
Here's a more complex example following your comment, handling many matches and lowercasing the verb :
var str = "SUM(Sales) + MIN(Revenue)";
var result = str.replace(/\b([^()]+)\(([^()]+)\)/g, function(_,a,b){
return b+'_'+a.toLowerCase()
});
Result : "Sales_sum + Revenue_min"
Try with:
var input = 'sum(Sales)',
matches = input.match(/^([^(]*)\(([^)]*)/),
output = matches[2] + '_' + matches[1];
console.log(output); // Sales_sum
Also:
var input = 'sum(Sales)',
output = input.replace(/^([^(]*)\(([^)]*)\)/, '$2_$1');
You can use replace with tokens:
'sum(Sales)'.replace(/(\w+)\((\w+)\)/, '$2_$1')
Using a whitelist for your list of prefixed words:
output = input.replace(/\b(sum|min|max|avg|xcount)\((.*?)\)/gi,function(_,a,b) {
return b.toLowerCase()+"_"+a;
});
Added \b, a word boundary. This prevents something like "haxcount(xorz)" from becoming "haxorz_xcount"

Capitalize first letter in java script

I know this has been answered before, but I'm a newb and I can't get it to work in my situation. Basically, I have pages that call the URL and display part of them on the page. I am hoping to have the first letter of the displayed word capitalize automatically.
This is an example of what i'm using:
<script>
var str = (window.location.pathname);
var str2 = "/seedling/";
document.write(str.substr(str2.length,(str.length - str2.length - 1 ) ) );
</script>
Thanks so much for your help, it is much appreciated!!
You can capitalise the first letter of a string like this:
var capitalised = yourString.charAt(0).toUpperCase() + yourString.slice(1);
Alternatively:
var capitalised = yourString.charAt(0).toUpperCase() + yourString.substring(1);
Assuming that your document.write call contains the string you want to capitalise:
var yourString = str.substr(str2.length,(str.length - str2.length - 1 ) );
var capitalised = yourString.charAt(0).toUpperCase() + yourString.slice(1);
If you have LoDash on hand, this can also be achieved using _.capitalize
_.capitalize('FRED');
// => 'Fred'

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