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Capture Groups and Extracting Matched Text in Python

Parentheses mark the part of a match you want back, and .group(n) retrieves it. This turns a regex from a yes/no test into an extractor — the difference between knowing a line contains a date and having the year in a variable.

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How Python Regex Capture Groups Extract Specific Text Using Parentheses and Group Methods

Capture groups constitute a formal mechanism within regular expression theory that isolates specific substrings from pattern matches by delimiting them with parentheses. These constructs operate unde…