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Test regular expressions. Live.

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Quick Reference

.
Any character except newline
\d
Digit [0-9]
\w
Word char [a-zA-Z0-9_]
\s
Whitespace
\b
Word boundary
^
Start of string/line (m)
$
End of string/line (m)
*
0 or more
+
1 or more
?
0 or 1 (lazy)
{n,m}
Between n and m
(...)
Capture group
(?:...)
Non-capture group
(?=...)
Lookahead
(?!...)
Negative lookahead
(?<=...)
Lookbehind
(?<!...)
Negative lookbehind
|
Alternation (OR)
[...]
Character class
[^...]
Negated char class
\1
Backreference (group 1)
\\
Escape character