Question

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rated 0 times [ 18] [ 4] / answers: 1 / hits: 19379 / 10 Years ago, wed, september 3, 2014, 12:00:00

I need to dynamically create a regex to use in match function javascript.
How would that be possible?

var p = *|;

var s = |*;

*|1387461375|* hello *|sfa|* *|3135145|* test.match(/p(d{3,})s/g)

this would be the right regex: /*|(d{3,})|*/g

even if I add backslashes to p and s it doesn't work. Is it possible?

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Location: Estonia

Member since Wed, Jun 8, 2022

2 Years ago

answered 10 Years ago tayla · Accepted Answer

RegExp is your friend:

var p = "\*\|", s = "\|\*"



var reg = new RegExp(p + '(\d{3,})' + s, 'g')



"*|1387461375|* hello *|sfa|* *|3135145|* test".match(reg)

The key to making the dynamic regex global is to transform it into a RegExp object, and pass 'g' in as the second argument.