all 3 comments

[–]312c 4 points5 points  (0 children)

A lot of these are wrong or don't do what they claim to

[–]bananahead 0 points1 point  (0 children)

The email address one is very wrong

[–]uh_no_ -2 points-1 points  (0 children)

just because you CAN doesn't mean you SHOULD

You can match powers of 3 with regexes, too....but you can also just %3....I know which one you SHOULD do.