Regex string not working correctly in RegExp.test

Asked Jun 28 '17 at 16:51

Active Jun 28 '17 at 16:51

Viewed 28 times

I have written a regex to match currency values with optional 2 decimal places, with either decimal point OR comma for EU.

^\d+((\.|,)\d{2})?$

The regex works as expected in regex101 tester: https://regex101.com/r/GrHsX0/1

But when using in javascript it's returning false regardless of match.

var patt = new RegExp("^\d+((\.|,)\d{2})?$");

var res1 = patt.test("11.33"); //should return true
var res2 = patt.test("22,44"); //should return true
var res3 = patt.test("abc"); //should return false

Here is a fiddle example: https://jsfiddle.net/t0p4ok08/

Bit puzzled as to why this is not working! Thanks in advance.

asked Jun 28 '17 at 16:51

Rob C

1

*Double escape guys, double escape.* – revo Jun 28 '17 at 16:53
1

and you don't need alternatives in this case. A character class does the job `^\d+(?:[.,]\d{2})?$` – revo Jun 28 '17 at 16:55
1

You don't need a constructor, or quotes, or escaping: `var patt = /^\d+((\.|,)\d{2})?$/;` – Jun 28 '17 at 16:57
... only if he's going to use a *literal notation* instead. @ChrisG – revo Jun 28 '17 at 17:01
Thanks for the info guys – Rob C Jun 29 '17 at 09:26

Regex string not working correctly in RegExp.test

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