[paulryanrogers]

Less code is generally better. But I've noticed a lot of folks still using ^ or $ when what they really mean is \A or \z

[voltagex_]

What's the difference? ^ and $ is basically all I remember from when I read Mastering Regular Expressions

[eCa]

\A and \z always match beginning/end of the string.

^ and $ can be changed to mean beginning/end of each line in the string with the /m flag.