Working with regular expressions

Regular expressions in py

If we got the regular expression then using with that we can get the format string/ numbers 

In order to play with them we need to have a pkg called "exrex"
To install the pkg use below cmd :

pip install exrex

Exrex is a command line tool and python module that generates all - or random - matching strings to a given regular expression and more. It's pure python, without external dependencies.

There are regular expressions with infinite matching strings (eg.: [a-z]+), in these cases exrex limits the maximum length of the infinite parts.

Features

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

USAGE:

>>> 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])

Source :https://github.com/asciimoo/exrex