Javascript RegExpression

Question

I am looking for a regular expression that will accept date formats, both MM/DD/YYYY and M/D/YYYY

I found one here

However when I run that I get an unexpected illegal token. Here is how I am implementing the javascript function

return RegExp(/^(((0?[1-9]|1[012])/(0?[1-9]|1\d|2[0-8])|(0?[13456789]|1[012])/(29|30)|(0?[13578]|1[02])/31)/(19|[2-9]\d)\d{2}|0?2/29/((19|[2-9]\d)(0[48]|[2468][048]|[13579][26])|(([2468][048]|[3579][26])00)))$/).test(txtDate);

I've been told the http://regexlib.com website usually works well for .net regular expressions, but not javascript.

Any help would be great!

Toto · Accepted Answer · 2012-02-08 16:34:18Z

1

Escape the slashes inside the regex.

/^(((0?[1-9]|1[012])\/(0?[1-9]|1\d|2[0-8])|(0?[13456789]|1[012])\/(29|30)|(0?[13578]|1[02])\/31)\/(19|[2-9]\d)\d{2}|0?2\/29\/((19|[2-9]\d)(0[48]|[2468][048]|[13579][26])|(([2468][048]|[3579][26])00)))$/
             here __^                                         __^                        __^ ___^                   ___^___^

edited Feb 8, 2012 at 16:34

answered Feb 8, 2012 at 16:29

Toto

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4 Comments

Jon Harding Over a year ago

I'm a newbie to this can I do that with the "\"

Toto Over a year ago

@JonHarding: Just insert a backslash ` before each slash /` as shown in my answer.

Jon Harding Over a year ago

I just realized this regex only goes back to 1900, any ideas on a quick fix?

Toto Over a year ago

@JonHarding: I'm afraid there's no quick way to fix it. The regex will become very complicated.

xdevel · Accepted Answer · 2012-02-08 16:28:41Z

0

for MM/DD/YY /^(\d{1,2})[./-](\d{1,2})[./-](\d{4})$/

for M/D/Y /^(\d{1,2})[./-](\d{1,2})[./-](\d{2}|\d{4})$/

answered Feb 8, 2012 at 16:28

xdevel

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KM. · Accepted Answer · 2012-02-08 16:28:59Z

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Recipe 4.4 from Regex Cookbook does most of what you are looking for:

^(1[0-2]|0?[1-9])/(3[01]|[12][0-9]|0?[1-9])/(?:[0-9]{2})?[0-9]{2}$

answered Feb 8, 2012 at 16:28

KM.

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Oscar Jara · Accepted Answer · 2012-02-10 19:18:40Z

0

Take a look at this:

http://jsfiddle.net/oscarj24/32JQr/

hope this helps

answered Feb 10, 2012 at 19:18

Oscar Jara

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