Get all substrings inside a string that match a regular expression [duplicate]

Question

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How can I match multiple occurrences with a regex in JavaScript similar to PHP's preg_match_all()?

In Javascript, is it possible to find the starting and ending indices of all substrings within a string that match a regular expression?

Function signature:

function getMatches(theString, theRegex){ //return the starting and ending indices of match of theRegex inside theString //a 2D array should be returned }

For example:

getMatches("cats and rats", /(c|r)ats/);

should return the array [[0, 3], [9, 12]], which represents the starting and ending indices of "cats" and "rats" within the string.

sachleen · Accepted Answer · 2012-08-20 02:35:24Z

Use match to find all substrings that match the regex.

> "cats and rats".match(/(c|r)ats/g) > ["cats", "rats"]

Now you can use indexOf and length to find the start/end indices.

xdazz · Accepted Answer · 2012-08-20 02:39:02Z

function getMatches(theString, theRegex){ return theString.match(theRegex).map(function(el) { var index = theString.indexOf(el); return [index, index + el.length - 1]; }); } getMatches("cats and rats", /(c|r)ats/g); // need to use `g`

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