Chapter 23: Advanced Python Programming – Mastering Python Regular Expressions
23.1 Introduction to Regular Expressions (Regex) Regular Expressions (Regex) are powerful tools used to perform pattern matching and text manipulation in strings. Python provides a built-in library called re for working with regular expressions. Understanding and mastering Regex can dramatically increase efficiency in text processing, data extraction, and input validation tasks. 23.2 The re Module in Python The re module offers several functions: re.match() : Determines if the RE matches at the beginning of the string. re.search() : Scans through a string looking for any location where the RE matches. re.findall() : Returns all non-overlapping matches of RE in the string. re.finditer() : Returns an iterator yielding match objects over all matches. re.sub() : Replaces matched substrings with a new string. re.split() : Splits the string by occurrences of the pattern. Example: import re text = "Python is powerful. Python is easy to learn....