Regular Expressions Syntax

Perl

Repeats
* Match 0 or more times
+ Match 1 or more times
? Match 1 or 0 times
{n} Match exactly n times
{n,} Match at least n times
{n,m} Match at least n but not more than m times

RegEx

. Match any character
\w Match "word" character (alphanumeric plus "_")
\W Match non-word character
\s Match whitespace character
\S Match non-whitespace character
\d Match digit character
\D Match non-digit character
\t Match tab
\n Match newline
\r Match return
\f Match formfeed
\a Match alarm (bell, beep, etc)
\e Match escape
\021 Match octal char ( in this case 21 octal)
\xf0 Match hex char ( in this case f0 hexidecimal)