Intro To Regex Cheat Sheet!

Here are some snippets to get started!

Name	Info	Example
Flags	g=global, I=insensitive	/cat/gi
letters	You know letters	/dog/
digits	You know digits	/12/
Character Set/Class	Brackets	/[aeiou]/
Negated Character Set	Carrot and brackets	/[^aeiou]/
O or more	*	/a*/
1 or more	+	/a+/
0 or 1	?	/a?/
Start of string	Carrot, no brackets	/^hi/
End of string	Dollar sign	/bye$/
Quantifier exactly	Braces, one number	/AH{10}/
Quantifier at least X many	Braces, one number and comma	/OH{3,}/
Quantifier exact range	Braces, two comma separated numbers	/WO{2,4}W/
Groups	Parens with optional pipe OR operator	/(my)\s(cat\|dog)/

Special Characters

Character Class	Definition
[0-9]	Any single digit
[3-30]	And number in range
[a-z]	Any lowercase letter
[a-d]	Any lowercase letter in range
[A-Z]	Any uppercase letter
[E-Q]	Any uppercase letter
[a-zA-Z]	Any letter
\d	Any single digit
\D	Any NON digit
\w	Any alphanumeric (and _)
\W	Any NON alphanumeric
\s	Any whitespace character
\S	Any NON whitespace character
\b	Any work break
\B	Any NON word break
.	Any character at all
\.	An escaped period