How to include a variable in a regex expression in Javascript? [duplicate]

Question

Possible Duplicate:
Javascript Regex: How to put a variable inside a regular expression?

I'm using the following for as regex pattnern in a sinon.js fakeServer response:

/https:\/\/ca-davstorage:8080\/myFile.json(\?.*|$)/

I would like to replace myFile with a variable, but as I'm not really good at regex, I'm struggling to get it to work. Currently I have this, but it does not seem to work.

'https:\\/\\/ca-davstorage:8080\\/'+myFile+'.json(\\?.*|$)/'

Question:
How to I correctly add a variable to a regex?

Thanks for help!

@FelixKling: ah, yes. Sorry for re.asking...

frequent
– frequent

2013-01-16 13:22:39 +00:00
Commented Jan 16, 2013 at 13:22 — frequent
– frequent, Commented Jan 16, 2013 at 13:22

Minko Gechev · Accepted Answer · 2013-01-16 13:12:48Z

5

Instead of using /regex/ use the constructor function RegExp.

Example:

var foo = 'bar',
    re = new RegExp('[0-9]' + foo, 'g');
re.test('1bar'); //true

The first argument of the RegExp constructor is the regular expression, the second one is the modifier.

answered Jan 16, 2013 at 13:12

Minko Gechev

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3 Comments

frequent Over a year ago

ok. let me try if I can fit this into my function.

frequent Over a year ago

ok. Worked. Thank you very much!

Minko Gechev Over a year ago

You're welcome, I'm glad that my answer helped.

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