Learn Python Regular Expressions step by step from beginner to advanced levels
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Apr 18, 2025 - Python
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regular-expressions
A regular expression (shortened as regex or regexp), sometimes referred to as rational expression, is a sequence of characters that specifies a match pattern in text. Usually such patterns are used by string-searching algorithms for “find” or “find and replace” operations on strings, or for input validation.
Regular expression techniques are developed in theoretical computer science and formal language theory. They are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical analysis. Regular expressions are also supported in many programming languages.
Different syntaxes for writing regular expressions have existed since the 1980s, one being the POSIX standard and another, widely used, being the Perl syntax.
Here are 227 public repositories matching this topic...
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An implementation of regular expressions for Python that uses a finite state automaton（正则引擎的Python实现，包括从NFA到DFA和DFA的最小化）
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TokenQuery (regular expressions over tokens)
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Regular expressions reverser for Python
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Backtracking regular expression engine written in Python
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This code is an OCR application that extracts text from images uploaded by users, using the EasyOCR library. The extracted text is then processed to extract information such as email, phone number, pin code, address, and website URL, and displayed on a Streamlit web app interface.
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Cython based high performance alternative to Python (re) module for doing basic pattern matching on large data-set..
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Created by Stephen Cole Kleene
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