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contrib/advanced-python/regular_expressions.md
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## Regular Expressions in Python ## Regular Expressions in Python
Regular expressions (regex) are a powerful tool for pattern matching and text manipulation. Regular expressions (regex) are a powerful tool for pattern matching and text manipulation.
Python's re module provides comprehensive support for regular expressions, enabling efficient text processing and validation. Python's re module provides comprehensive support for regular expressions, enabling efficient text processing and validation.
Regular expressions (regex) are a versitile tool for matching patterns in strings. In Python, the `re` module provides support for working with regular expressions. Regular expressions (regex) are a versitile tool for matching patterns in strings. In Python, the `re` module provides support for working with regular expressions.
## 1. Introduction to Regular Expressions ## 1. Introduction to Regular Expressions
A regular expression is a sequence of characters defining a search pattern. Common use cases include validating input, searching within text, and extracting A regular expression is a sequence of characters defining a search pattern. Common use cases include validating input, searching within text, and extracting
specific patterns. specific patterns.
## 2. Basic Syntax ## 2. Basic Syntax
Literal Characters: Match exact characters (e.g., abc matches "abc"). Literal Characters: Match exact characters (e.g., abc matches "abc").
Metacharacters: Special characters like ., \*, ?, +, ^, $, [ ], and | used to build patterns. Metacharacters: Special characters like ., \*, ?, +, ^, $, [ ], and | used to build patterns.
@ -19,7 +16,7 @@ Metacharacters: Special characters like ., \*, ?, +, ^, $, [ ], and | used to bu
- .: Any character except newline. - .: Any character except newline.
- ^: Start of the string. - ^: Start of the string.
- $: End of the string. - $: End of the string.
- \*: 0 or more repetitions. - *: 0 or more repetitions.
- +: 1 or more repetitions. - +: 1 or more repetitions.
- ?: 0 or 1 repetition. - ?: 0 or 1 repetition.
- []: Any one character inside brackets (e.g., [a-z]). - []: Any one character inside brackets (e.g., [a-z]).