a simple regex table for later reference.

regex guide

_Symbol_    _Description_
.           Any single character
\d          Any single digit
[A-Z]       Any character between A and Z (uppercase)
[a-z]       Any character between a and z (lowercase)
[A-Za-z]    Any character between a and z (case-insensitive)
+           One or more of the previous expression (for example, \d+ matches one or more digits)
[^/]+       One or more characters until (and not including) a forward slash
?           Zero or one of the previous expression (for example, \d? matches zero or one digits)
*           Zero or more of the previous expression (for example, \d* matches zero, one or more than one digit)
{1,3}       Between one and three (inclusive) of the previous expression (for example, \d{1,3} matches 1, 2, or 3 digits)


_Note_: Most of this table was stolen from "The Definitive Guide to Django: Web Development Done Right".