Ranges, while they can be done, are a really bad application of regex. If you have a range of values and are only selecting one, that's one thing but you are wanting it to understand a range.  You'd be better served using a datetime function to evaluate this.

A regex of this nature will not guarantee a proper range because regexes don't understand time, just text.  If I put in a time 02:00 PM - 08:00AM it isn't going to know the order is wrong (or going backwards)

---

Michael

"In theory, theory and practice are the same. In practice, they are not."
Albert Einstein