Enter a regular expression in the top text area;
double-click in
the bottom area to enter the target input to match. As soon as you tab,
[esc], or click out of the bottom area, matching will begin.
You can choose between Perl/PHP-like or Java regular expression syntax,
and whether the target text is highlighted to show matches, edits,
replacements, or splits.
The
animate option lets you watch the regex engine at work.
Creating a
matchmark sends your browser to a bookmarkable
URI that will reproduce the current regex pattern, settings, and
target text.
Clicking a match gives more info, including how the capturing groups
matched.
Regex Powertoy was created by
Gordon Mohr.
Please visit my blog to leave
questions,
comments, and suggestions. There is also a
technical
overview.
point to a production to show its definition
chars
x
The character x
\\
The backslash character
\t
The tab character ('\u0009')
\n
The newline (line feed) character ('\u000A')
\r
The carriage-return character ('\u000D')
\f
The form-feed character ('\u000C')
\a
The alert (bell) character ('\u0007')
\e
The escape character ('\u001B')
\cx
The control character corresponding to x
\0n
The character with octal value 0n
(0 <= n <= 7)
\0nn
The character with octal value 0nn
(0 <= n <= 7)
\0mnn
The character with octal value 0mnn
(0 <= m <= 3,
0 <= n <= 7)
\xhh
The character with hexadecimal value 0xhh
\uhhhh
The character with hexadecimal value 0xhhhh
logical
XY
X followed by Y
X|Y
Either X or Y
(X)
X, as a capturing group
backref
\n
Whatever the nth capturing group matched
quoting
\
Nothing, but quotes the following character
\Q
Nothing, but quotes all characters until \E
\E
Nothing, but ends quoting started by \Q
classes
.
Any character (may or may not match line terminators)
\d
A digit: [0-9]
\D
A non-digit: [^0-9]
\s
A whitespace character: [ \t\n\x0B\f\r]
\S
A non-whitespace character: [^\s]
\w
A word character: [a-zA-Z_0-9]
\W
A non-word character: [^\w]
[abc]
a, b, or c (simple class)
[^abc]
Any character except a, b, or c (negation)
[a-zA-Z]
a through z
or A through Z, inclusive (range)
[a-d[m-p]]
a through d,
or m through p: [a-dm-p] (union)
[a-z&&[def]]
d, e, or f (intersection)
[a-z&&[^bc]]
a through z,
except for b and c: [ad-z] (subtraction)
[a-z&&[^m-p]]
a through z,
and not m through p: [a-lq-z](subtraction)
greedy
X?
X, once or not at all
X*
X, zero or more times
X+
X, one or more times
X{n}
X, exactly n times
X{n,}
X, at least n times
X{n,m}
X, at least n but not more than m times
reluctant
X??
X, once or not at all
X*?
X, zero or more times
X+?
X, one or more times
X{n}?
X, exactly n times
X{n,}?
X, at least n times
X{n,m}?
X, at least n but not more than m times
possessive
X?+
X, once or not at all
X*+
X, zero or more times
X++
X, one or more times
X{n}+
X, exactly n times
X{n,}+
X, at least n times
X{n,m}+
X, at least n but not more than m times
bounds
^
The beginning of a line
$
The end of a line
\b
A word boundary
\B
A non-word boundary
\A
The beginning of the input
\G
The end of the previous match
\Z
The end of the input but for the final terminator, if any
\z
The end of the input
special
(?:X)
X, as a non-capturing group
(?idmsux-idmsux)
Nothing, but turns match flags on - off
(?idmsux-idmsux:X)
X, as a non-capturing group with the
given flags on - off
(?=X)
X, via zero-width positive lookahead
(?!X)
X, via zero-width negative lookahead
(?<=X)
X, via zero-width positive lookbehind
(?<!X)
X, via zero-width negative lookbehind
(?>X)
X, as an independent, non-capturing group
POSIX
\p{Lower}
A lower-case alphabetic character: [a-z]
\p{Upper}
An upper-case alphabetic character:[A-Z]
\p{ASCII}
All ASCII:[\x00-\x7F]
\p{Alpha}
An alphabetic character:[\p{Lower}\p{Upper}]
\p{Digit}
A decimal digit: [0-9]
\p{Alnum}
An alphanumeric character:[\p{Alpha}\p{Digit}]
\p{Punct}
Punctuation: One of !"#$%&'()*+,-./:;<=>?@[\]^_`{|}~
\p{Graph}
A visible character: [\p{Alnum}\p{Punct}]
\p{Print}
A printable character: [\p{Graph}\x20]
\p{Blank}
A space or a tab: [ \t]
\p{Cntrl}
A control character: [\x00-\x1F\x7F]
\p{XDigit}
A hexadecimal digit: [0-9a-fA-F]
\p{Space}
A whitespace character: [ \t\n\x0B\f\r]
Java \p{javaLowerCase}
Equivalent to java.lang.Character.isLowerCase()
\p{javaUpperCase}
Equivalent to java.lang.Character.isUpperCase()
\p{javaWhitespace}
Equivalent to java.lang.Character.isWhitespace()
\p{javaMirrored}
Equivalent to java.lang.Character.isMirrored()
Unicode
\p{InGreek}
A character in the Greek block
\p{Lu}
An uppercase letter
\p{Sc}
A currency symbol
\P{InGreek}
Any character except one in the Greek block (negation)
[\p{L}&&[^\p{Lu}]]
Any letter except an uppercase letter (subtraction)
flags
(?i)
case-insensitive matching (US-ASCII only unless (?u))
(?d)
Unix lines mode -- only \n counts as line-end
(?m)
multiline mode -- ^ and $ also match around line-terminators
(?s)
single-line (dotall) mode -- . matches line-terminators
(?u)
Unicode-aware case-folding (used with (?i))
(?x)
permit whitespace and comments