Get index of each capture in a JavaScript regex

Question

I want to match a regex like /(a).(b)(c.)d/ with \"aabccde\", and get the following information back:

\"a\" at index = 0
\"b\" at i         


        

Answer 1

I wrote MultiRegExp for this a while ago. As long as you don't have nested capture groups, it should do the trick. It works by inserting capture groups between those in your RegExp and using all the intermediate groups to calculate the requested group positions.

var exp = new MultiRegExp(/(a).(b)(c.)d/);
exp.exec("aabccde");

should return

{0: {index:0, text:'a'}, 1: {index:2, text:'b'}, 2: {index:3, text:'cc'}}

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