• Generating all matching strings
• Generating a random matching string
• Counting the number of matching strings
• Simplification of regular expressions

$ pip install exrex

$ easy_install exrex

>>> import exrex
 
 >>> exrex.getone('(ex)r\\1')
 'exrex'
 
 >>> list(exrex.generate('((hai){2}|world!)'))
 ['haihai', 'world!']
 
 >>> exrex.getone('\d{4}-\d{4}-\d{4}-[0-9]{4}')
 '3096-7886-2834-5671'
 
 >>> exrex.getone('(1[0-2]|0[1-9])(:[0-5]\d){2} (A|P)M')
 '09:31:40 AM'
 
 >>> exrex.count('[01]{0,9}')
 1023
 
 >>> print '\n'.join(exrex.generate('This is (a (code|cake|test)|an (apple|elf|output))\.'))
 This is a code.
 This is a cake.
 This is a test.
 This is an apple.
 This is an elf.
 This is an output.
 
 >>> print exrex.simplify('(ab|ac|ad)')
 (a[bcd])

> exrex --help
 usage: exrex.py [-h] [-o FILE] [-l] [-d DELIMITER] [-v] REGEX
 
 exrex - regular expression string generator
 
 positional arguments:
   REGEX                 REGEX string
 
 optional arguments:
   -h, --help            show this help message and exit
   -o FILE, --output FILE
                         Output file - default is STDOUT
   -l N, --limit N       Max limit for range size - default is 20
   -c, --count           Count matching strings
   -m N, --max-number N  Max number of strings - default is -1
   -r, --random          Returns a random string that matches to the regex
   -s, --simplify        Simplifies a regular expression
   -d DELIMITER, --delimiter DELIMITER
                         Delimiter - default is \n
   -v, --verbose         Verbose mode

$ exrex '[asdfg]'
 a
 s
 d
 f
 g
 
 $ exrex -r '(0[1-9]|1[012])-\d{2}'
 09-85
 
 $ exrex '[01]{10}' -c
 1024
 

• Boat: exrex '( {20}(\| *\\|-{22}|\|)|\.={50}| ( ){0,5}\\\.| {12}~{39})'
• Eyes: exrex '(o|O|0)(_)(o|O|0)'

• regldg (features a live demo on the website)
• regex-genex (supports using multiple regex patterns simultaneously)

• randexp.js (features several live demos on the website)
• rstr.xeger (a method of the rstr Python module)

• python -m cProfile exrex.py '[a-zA-Z][a-zA-Z][a-zA-Z][a-zA-Z]' -o /dev/null
• python -m cProfile exrex.py '[0-9]{6}' -o /dev/null