How to input variable inside regex javascript?

Javascript Regex for date almost works, but is also catching string like 1.11.111.11, how can I prevent this?

• I am working on a regex and I think i'm about 90 % of the way there. I want it to match (which it seems to do fine): 2010 2010/01/30 2010/10/30 02:40 2010/10/30 02:40:20 2010/10/30 02:40:20 AM 2010/10/30 02:40:20 PM 2010-01-30 2010-10-30 02:40 2010-10-30 02:40:20 2010-10-30 02:40:20 AM 2010-10-30 02:40:20 PM I don't want it to match (or any other combination of strings delimited by periods): 1.11.111.11 Here is some test code I was running in chrome developer ( after the ... that yahoo answers is inserting I have s+([ap]m|[AP]M)|\d\d/). var test = "1.11.111.11"; test.match(/^(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])(19|20)\d\d[- /.](0[1-9]|1[0-2]):[0-5][0-9]\s+([ap]m|[… Returns: ["11", undefined, undefined, undefined, undefined, undefined] var test = "1.11.111.11"; test.match(/^(0[1-9]|1[012])[- /](0[1-9]|[12][0-9]|3[01])(19|20)\d\d[- /](0[1-9]|1[0-2]):[0-5][0-9]\s+([ap]m|[A… Returns; ["11", undefined, undefined, undefined, undefined, undefined] How can I modify the regex to not get that (or similar) period delimited strings? Thanks for your help!

• Answer:

  your character set [-/.] means you're searching for three cases: a hyphen a slash or a period try [-/]