ure – simple regular expressions

This module implements a subset of the corresponding CPython module, as described below. For more information, refer to the original CPython documentation: re.

This module implements regular expression operations. Regular expression syntax supported is a subset of CPython re module (and actually is a subset of POSIX extended regular expressions).

Supported operators are:

Match any character.
Match set of characters. Individual characters and ranges are supported.









Grouping. Each group is capturing (a substring it captures can be accessed with match.group() method).

Counted repetitions ({m,n}), more advanced assertions, named groups, etc. are not supported.



Compile regular expression, return regex object.

ure.match(regex_str, string)

Compile regex_str and match against string. Match always happens from starting position in a string.

ure.search(regex_str, string)

Compile regex_str and search it in a string. Unlike match, this will search string for first position which matches regex (which still may be 0 if regex is anchored).


Flag value, display debug information about compiled expression.

Regex objects

Compiled regular expression. Instances of this class are created using ure.compile().


Similar to the module-level functions match() and search(). Using methods is (much) more efficient if the same regex is applied to multiple strings.

regex.split(string, max_split=-1)

Split a string using regex. If max_split is given, it specifies maximum number of splits to perform. Returns list of strings (there may be up to max_split+1 elements if it’s specified).

Match objects

Match objects as returned by match() and search() methods.


Return matching (sub)string. index is 0 for entire match, 1 and above for each capturing group. Only numeric groups are supported.