Regular Expression Tester

This page uses the regular expression parser in your browser's implementation of JavaScript. This page should work with any browser that obeys the DOM, and Internet Explorer.* If you're looking for a .NET Regex tester, there's a crackerjack one here.

Tips

Expression	Matches
[abc]	A single character: a, b, or c
[^abc]	Any single character but a, b, or c
[a-z]	Any character in the range a-z
[a-zA-Z]	Any character in the range a-z or A-Z (any alphabetical character)
\s	Any whitespace character [ \t\n\r\f\v]
\S	Any non-whitespace character [^ \t\n\r\f\v]
\d	Any digit [0-9]
\D	Any non-digit [^0-9]
\w	Any word character [a-zA-Z0-9_]
\W	Any non-word character [^a-zA-Z0-9_]
\b	A word boundary between \w and \W
\B	A position that is not a word boundary
\|	Alternation: matches either the subexpression to the left or to the right
()	Grouping: group all together for repetition operators
^	Beginning of the string
$	End of the string

Repetition Operator	Meaning
{n,m}	Match the previous item at least n times but no more than m times
{n,}	Match the previous item n or more times
{n}	Match exactly n occurrences of the previous item
?	Match 0 or 1 occurrences of the previous item {0,1}
+	Match 1 or more occurrences of the previous item {1,}
*	Match 0 or more occurrences of the previous item {0,}

Option	Description
g	"Global" -- find all matches in the string rather than just the first
i	"case Insensitive" -- ignore character case when matching
m	"Multiline" -- search over more than one line if the text contains line breaks

* The previous version of this page worked only with Internet Explorer. I'm sorry if it caused you any inconvenience.