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Pythex: a Python regular expression editor

pythex

A Python re module tester that runs entirely in your browser.

Loading Python Environment...

This might take a moment.

pythex

A Python re module tester that runs entirely in your browser.

Your regular expression:

Your test string:

Python source:

>>> 
>>>

Flags

Mode

Match result:

Match captures:

Results will appear here.

Regular Expression Cheatsheet

▼

Special Characters

`\`	escape special characters
`.`	matches any character (newlines only if DOTALL)
`^`	matches beginning of string
`$`	matches end of string
`[5b-d]`	matches '5', 'b', 'c' or 'd'
`[^a-c6]`	matches any char except 'a', 'b', 'c' or '6'
`R\|S`	matches regex R or S
`()`	creates a capture group

Quantifiers

`*`	0 or more
`+`	1 or more
`?`	0 or 1
`{m}`	exactly m occurrences
`{m,n}`	from m to n
`{m,n}?`	from m to n, as few as possible
`*?`	non-greedy

Special Sequences

`\A`	start of string
`\b`	word boundary
`\B`	not word boundary
`\d`	digit
`\D`	non-digit
`\s`	whitespace
`\S`	non-whitespace
`\w`	alphanumeric
`\W`	non-alphanumeric
`\Z`	end of string

Groups & Lookarounds

`(?i)(?m)(?s)(?x)`	sets re.X flags
`(?:...)`	non-capturing group
`(?P<n>...)`	named group
`(?#...)`	a comment
`(?=...)`	lookahead assertion
`(?!...)`	negative lookahead
`(?<=...)`	lookbehind assertion
`(?<!...)`	negative lookbehind
`(?(id)y\|n)`	conditional match