Check python regex online

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> regex quick reference (hide):

[abx-z]	One character of: a, b, or the range x-z
[^abx-z]	One character except: a, b, or the range x-z
a\|b	a or b
a?	Zero or one a’s (greedy)
a??	Zero or one a’s (lazy)
a*	Zero or more a’s (greedy)
a*?	Zero or more a’s (lazy)
a+	One or more a’s (greedy)
a+?	One or more a’s (lazy)
a	Exactly 4 a’s
a	Between (inclusive) 4 and 8 a’s
a	9 or more a’s
(?>. )	An atomic group
(?=. )	A positive lookahead
(. )	A negative lookahead
(?	A positive lookbehind
(?	A negative lookbehind
(. )	A non-capturing group
(. )	A capturing group
(?P. )	A capturing group named n

^	Beginning of the string
$	End of the string
\d	A digit (same as 8 )
\D	A non-digit (same as [^0-9] )
\w	A word character (same as [_a-zA-Z0-9] )
\W	A non-word character (same as [^_a-zA-Z0-9] )
\s	A whitespace character
\S	A non-whitespace character
\b	A word boundary
\B	A non-word boundary
\n	A newline
\t	A tab
\cY	The control character with the hex code Y
\xYY	The character with the hex code YY
\uYYYY	The character with the hex code YYYY
.	Any character
\Y	The Y’th captured group
(?1)	Recurse into numbered group 1
(?&x)	Recurse into named group x
(?P=n)	The captured group named ‘n’
(?#. )	A comment

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Check python regex online

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Tools
Format Regex (requires free-spacing, /x)
Code Generator
Regex Debugger n/a Unit tests

Filter flavors
PCRE PCRE (PHP)
JS JavaScript
PY Python

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Check python regex online

You seem to be using an outdated version of your browser which is no longer supported by regexpr.com. It is highly recommended that you upgrade your browser. Sorry for the inconvenience.

Save & Share
Save Regex (CTRL+S)
Fork Regex
Add to Regex Library

Flavor
PCRE PCRE (PHP)
JS JavaScript
PY Python
capture-group-regex capture group regex
email-regex email regex
email-validation-javascript email validation javascript
end-of-line-regex end of line regex
java-regex-match java regex match
java-regex-replace java regex replace
java-regex-tester java regex tester
javascript-regex-match javascript regex match
javascript-regex-tester javascript regex tester
javascript-string-match javascript string match
look ahead regex look ahead regex
multiline regex multiline regex
password validation in javascript password validation in javascript
perl regex tester Perl regex tester
phone number validator javascript phone number validator javascript
php regex replace php regex replace
powershell regex replace powershell regex replace
python regex tester python regex tester
python regex tester regex excel
regex for alphanumeric regex for alphanumeric
regex for alphanumeric regex for any character
regex for date regex for date
regex for digits regex for digits
regex for ip address regex for ip address
regex for number regex for number
regex for password regex for password
regex for phone number validator regex for phone number validator
regex look behind regex look behind
regex match regex match
regex php regex php
regex start of line regex replace
regex tester regex tester
regex tester regex url validation
regex validation regex validation
regex with new line regex with new line
ruby regex tester ruby regex tester
space-in-regex space in regex

Tools
Format Regex (requires free-spacing, /x)
Code Generator
Regex Debugger n/a Unit tests

Filter flavors
PCRE PCRE (PHP)
JS JavaScript
PY Python

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Regex Tester

CyrilEx is an online regex debugger, it allows you to test regular expression in PHP (PCRE), Python, Ruby, JavaScript, Java and MySQL. It helps you to test and debug regex online, you can visualize the matches when matching a string against a regex.

A regex visualizer allows to visualize your regex, it helps to understand it. This feature is useful for large regexes.

Cyrilex also allows you to generate a string example from a RegEx. This gives a pretty quick idea of a regex.

You can consult the regex Quick Start or see the full user guide to help you to use this regular expression tester.

User guide

Step 0: Choose the regex engine: JavaScript, Ruby, Java or PCRE (PHP, Python).
Step 1: Copy and paste or directly type your regular expression to test in the «Regular expression to test» field.
Step 2: Select the flags you want in «Flags» section.
Step 3: Copy and paste or directly type your test string in the «test string» field.

As soon as you make a modification (regular expression, flags or test string):

Step 4: An explanation is generated about of your regex. It uses regulex, it is a JavaScript Regular Expression Parser & Visualizer (Written in pure JavaScript).
Step 5: A message indicates the number of correspondence
Your regex is highlighted according to the syntax. It is a beta version, it can be wrong.

Generate a string from RegEx (Beta):
Clicks on «Generate a string from RegEx (Beta)» in order to generate a string that matches with the regex.

Substitutions are not managed.

News: You can now test MySQL regex, select the «MySQL 8» engine.

About regular expression

A regular expression is a sequence of characters that define a search pattern. This pattern is used by string searching algorithms for find or replace text. It can be useful to validate an EMAIL address or an IP address.

Regex support is part of the standard library of many programming languages. Each programming language has its own regex engine, regular expression implementations vary slightly between languages.

Regex humor (Jamie Zawinski):
Some people, when confronted with a problem, think «I know, I’ll use regular expressions.» Now they have two problems.

Regex Online

Cyrilex is an online regex checker, it allows to easily test and debug regex. This avoids wasting time writing the few lines of code needed to do the tests.

A regex visualizer and a regex generator help you to understand and debug your regexes.

This tool also allows you to share your regular expressions, this can be useful when you want to explain one of your regex problems (or its resolution) on a forum.

Regex Generator

Cyrilex also allows generating string from your Regex. By generating a string, this can help understand the Regex. This is particularly useful for fairly long regex.

This is also useful in the opposite direction. You can validate that your regex is correct by validating that the thong generated corresponds to the expected.

This tool does not manage all the features of the Regex.

The unavoidables

Some regex that can be useful (without warranty).

The last RFC is complex, there is no reliable solution, this regex should work more than 99% of the time (You must turn off case sensitivity).

The regex below allows to validate alphanumeric string. Be careful, \w authorizes the underscore character.

The regex below allows to validate MD5 string.

The regex below allows to validate IP v4.

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Check python regex online

Using regexes for extracting data from web pages? Check out ParseHub, a visual web scraping tool built by the team behind Debuggex.

Unit Tests (showhide) Help Add new unit test Login to add unit tests You haven’t added any unit tests yet > Total Tests: Passing (>); Failing (>)

> regex quick reference (hide):

[abx-z]	One character of: a, b, or the range x-z
[^abx-z]	One character except: a, b, or the range x-z
a\|b	a or b
a?	Zero or one a’s (greedy)
a??	Zero or one a’s (lazy)
a*	Zero or more a’s (greedy)
a*?	Zero or more a’s (lazy)
a+	One or more a’s (greedy)
a+?	One or more a’s (lazy)
a	Exactly 4 a’s
a	Between (inclusive) 4 and 8 a’s
a	9 or more a’s
(?>. )	An atomic group
(?=. )	A positive lookahead
(. )	A negative lookahead
(?	A positive lookbehind
(?	A negative lookbehind
(. )	A non-capturing group
(. )	A capturing group
(?P. )	A capturing group named n

^	Beginning of the string
$	End of the string
\d	A digit (same as 1 )
\D	A non-digit (same as [^0-9] )
\w	A word character (same as [_a-zA-Z0-9] )
\W	A non-word character (same as [^_a-zA-Z0-9] )
\s	A whitespace character
\S	A non-whitespace character
\b	A word boundary
\B	A non-word boundary
\n	A newline
\t	A tab
\cY	The control character with the hex code Y
\xYY	The character with the hex code YY
\uYYYY	The character with the hex code YYYY
.	Any character
\Y	The Y’th captured group
(?1)	Recurse into numbered group 1
(?&x)	Recurse into named group x
(?P=n)	The captured group named ‘n’
(?#. )	A comment

Full > regex cheatsheet Sharing Expression

Embed Expression

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