[csunbird]

Please do not forget the fact that after a couple of months, you want to make a small change, but you forgot the edge cases when you first created the regex :D

[b3kart]

Unit tests will help with this.

[m463]

I would have to unit-test my command line commands :)

[b3kart]

If they are critical: why not? If they aren't: you can live with missing a corner case or two. :-)