Regex trouble in JavaScript

Question

I am trying to extract data from a string using RegEx , but i am getting a NULL value as result.

here is my current code

var re = /(\[cid=(?:[0-9]*)(?:(?:,\[[^]]*\][^]]*)?|(?:,[^]]*))\])/;
var str = '[cid=5555,[CONSTIMG]5555.jpg]The Sample text is awesome';
var m;

while ((m = re.exec(str)) != null) {
    if (m.index === re.lastIndex) {
        re.lastIndex++;
    }

}

console.log(m[0]);

The value that i am getting back is NULL.

If anyone can point me in the right direction, that would be very helpful. Thanks in advance.

What are you trying to find? I can't attempt to help find a working regex if I don't know what you are looking for. Also, have you tried testing on a site like regexpal.com ? — David
– David, Commented Feb 24, 2015 at 22:59
@David it's showing as valid here, postimg.org/image/egmgh1n2f — creativecodes
– creativecodes, Commented Feb 24, 2015 at 23:04

brandonscript · Accepted Answer · 2015-02-24 23:18:21Z

2

Your expression matches PCRE regular expression syntax but not JavaScript because JavaScript requires that square brackets inside a character class be escaped with \. This is what you want:

(\[cid=(?:\d*)(?:(?:,\[[^\]]*\][^\]]*)?|(?:,[^\]]*))\])

Explained: https://regex101.com/r/pN4vP4/2

answered Feb 24, 2015 at 23:18

brandonscript

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