RegEx conversion to use with Javascript

Question

I'm currently using this RegEx ^(0[1-9]|1[0-2])/(19|2[0-1])\d{2}$ in .NET to validate a field with Month and Year (12/2000).

I'm changing all my RegEx validations to JavaScript and I'm facing an issue with this one because of /in the middle which I'm having problems escaping.

So based on other answers in SO I tried:

    RegExp.quote = function (str) {
        return (str + '').replace(/[.?*+^$[\]\\(){}|-]/g, "\\$&");
    };
    var reDOB = '^(0[1-9]|1[0-2])/(19|2[0-1])\d{2}$'

            var re = new RegExp(RegExp.quote(reDOB));
            if (!re.test(args.Value)) {
                args.IsValid = false;
                return;
            }

However, validations fails even with valid data.

How about just a simple var re = /^(0[1-9]|1[0-2])\/(19|2[0-1])\d{2}$/; which uses the regex operator // ?? — user557597
– user557597, Commented Jun 10, 2015 at 23:39
Oh, maybe. Doesn't it compile re there as a regex object ? — user557597
– user557597, Commented Jun 10, 2015 at 23:42
Sort of like a variant maybe var re = /.../; regex object, as opposed to var s = '...'; bstr object. — user557597
– user557597, Commented Jun 10, 2015 at 23:48
@Diomedes—for single digit months, remove the leading zero: /^([1-9]|1[0-2])\/(19|2[0-1])\d{2}$/ — RobG
– RobG, Commented Jun 11, 2015 at 0:14

Behzad · Accepted Answer · 2015-06-11 13:54:03Z

1

Remove ^ of first and $ from end of regex pattern. And add \ before any character which you want to match by pattern. so pattern is like this:

(0[1-9]|1[0-2])\/(19|2[0-1])\d{2}

You can test your regex from here

edited Jun 11, 2015 at 13:54

answered Jun 11, 2015 at 13:48

Behzad

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