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Ruby Regular Expression Tester

With this website you can easily test your ruby regular expressions directly in your browser.

Type your regular expression below.


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Recommended Reading: Prog_lang
Other recommended lectures:
-

Plesk and Fail2Ban



regex characters:
.
any character except newline
[ ]
any single character of set
[^ ]
any single character NOT of set
*
0 or more previous regular expression
*?
0 or more previous regular expression (non-greedy)
+
1 or more previous regular expression
+?
1 or more previous regular expression (non-greedy)
?
0 or 1 previous regular expression
|
alternation
( )
grouping regular expressions
^
beginning of a line or string
$
end of a line or string
{m,n}
at least m but most n previous regular expression
{m,n}?
at least m but most n previous regular expression (non-greedy)
\1-9
nth previous captured group
\&
whole match
\`
pre-match
\'
post-match
\+
highest group matched
\A
beginning of a string
\b
backspace(0x08)(inside[]only)
\b
word boundary(outside[]only)
\B
non-word boundary
\d
digit, same as[0-9]
\D
non-digit
\S
non-whitespace character
\s
whitespace character[ \t\n\r\f]
\W
non-word character
\w
word character[0-9A-Za-z_]
\z
end of a string
\Z
end of a string, or before newline at the end
(?#)
comment
(?:)
grouping without backreferences
(?=)
zero-width positive look-ahead assertion
(?!)
zero-width negative look-ahead assertion
(?>)
nested anchored sub-regexp. stops backtracking.
(?imx-imx)
turns on/off imx options for rest of regexp.
(?imx-imx:re)
turns on/off imx options, localized in group.
special character classes:
[:alnum:]
alpha-numeric characters
[:alpha:]
alphabetic characters
[:blank:]
whitespace - does not include tabs, carriage returns, etc
[:cntrl:]
control characters
[:digit:]
decimal digits
[:graph:]
graph characters
[:lower:]
lower case characters
[:print:]
printable characters
[:punct:]
punctuation characters
[:space:]
whitespace, including tabs, carriage returns, etc
[:upper:]
upper case characters
[:xdigit:]
hexadecimal digits
options:
/i
case insensitive
/o
only interpolate #{} blocks once
/m
multiline mode - '.' will match newline
/x
extended mode - whitespace is ignored
/[neus]
encoding: none, EUC, UTF-8, SJIS, respectively