Regular Expressions

Basics

Code	Description
.	Any character except newline
a	The character a
ab	The string ab
a|b	a or b
a*	0 or more a
\	Escapes a special character

Quantifiers

Code	Description
*	0 or more
+	1 or more
?	0 or 1
{1}	Exactly 1
{1,3}	Between 1 and 3
{1,}	1 or more

Groups and Ranges

Code	Description
(...)	Capturing group
(?:...)	Non-capturing group
[abc]	a,b or c
[^abc]	Not( a,b or c)
[ab-d]	a,b,c or d
[a-v]	Lower case letter from a to v
[A-V]	Upper case letter from A to V
[0-5]	Digit from 0 to 5

Classes

Code	Description
\d	One digit
\D	One non-digit
\s	One whitespace
\S	One non-whitespace
\w	One word character
\W	One non-word character

Assertions

Code	Description
^	Start of string
$	End of string
\b	Word boundary
\B	Non-word boundary
(?=...)	Positive lookahead
(?<=...)	Positive lookbehind
(?!...)	Negative lookahead
(?<!...)	Negative lookbehind

Examples

Name	Expression
Username	/^([a-zA-Z0-9_-]){2,15}$/
Password	/^(?=.*[a-z]{1,})(?=.*[A-Z]{1,})(?=.*[0-9]{1,})\w{8,}$/
Email	/^([a-z]{1})([a-z0-9-_\.]{1,})\@([a-z0-9-]{1,})\.([a-z]{2,6})$/
Phone	/^(\+33){0,1}(0){0,1}([1-9]{1})([0-9]{2})([0-9]{2})([0-9]{2})([0-9]{2})$/
Birthdate	/^(0[1-9]|[12][0-9]|3[01])\/(0[1-9]|1[0-2])\/\d{4}$/
Zipcode	/^\d{5}$/
HexColor	/^#([a-fA-F0-9]{3}|[a-fA-F0-9]{6}|[a-fA-F0-9]{8})$/
Slug	/^[a-z0-9-]{1,}$/