Regular expression for matching time in military (24 hour) format

Question

I would like a JavaScript regular expression that will match time using the 24 hour clock, where the time is given with or without the colon.

For example, I would li

Answer 1

Here's a blog post, looking for the same thing and a bunch of potential answers -- most of which don't work, but there is good discussion as to why each fails.

Of course, explicitly long and accurate is always a possibility!