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javascriptregexregex-groupregex-greedy

Regex capturing group only capturing last occurence

Here is my input:

start

        @var=somevar1
        @var=somevar2

end

I am using this regex

start(?:\s*\n*(?:@var=(.*)\s*)*)\s*\n*end

Its should give the output as

somevar1
somevar2

but its giving just somevar2.

Is there any way to get all occurrence of the capturing group?

Solution

  • One option is to use a positive lookbehind with an inifite quantifier to assert start followed by a newline at the left.

    See the support for lookbehinds.

    (?<=^start\n[^]*@var=)\S+(?=[^]*\nend$)

    Regex demo

    const regex = /(?<=^start\n[^]*@var=)\S+(?=[^]*\nend$)/gm;
const str = `start

        @var=somevar1
        @var=somevar2

end`;
let m;

console.log(str.match(regex));

    If there can only be formats of @var=somevar preceding and following instead of other content:

    (?<=^start\n\s*(?:@var=\S+\s+)*@var=)\S+(?=(?:\s*@var=\S+)*\s*\nend$)

    See another regex demo