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Python regular expressions - tutorials point, Python regular expressions - learning python in simple and easy steps : a beginner’s tutorial containing complete knowledge of python syntax object oriented language.
Python tutorial: regular expressions python - 2016, This one matches the beginning (^) of the string, and then (d{3}). what’s d{3}? d means any numeric digit (0 through 9). the {3} means match exactly three numeric.
Pyregex, Pyregex is a online regular expression tester to check validity of regular expressions in the python language regex subset..

2. lexical analysis — python 3.5.2 documentation, 2. lexical analysis¶ python program read parser. input parser stream tokens, generated lexical analyzer. chapter describes .

https://docs.python.org/3/reference/lexical_analysis.html
Scripting languages : node.js, php, python, ruby (sheet, Python: assume os, , sys imported. grammar execution. interpreter. customary interpreter invoke ..

https://hyperpolyglot.org/scripting
Python module - regular expressions python, Easily power regular expressions python scripts regexbuddy. create analyze regex patterns regexbuddy’ intuitive regex building blocks..

https://www.regular-expressions.info/python.html