#Python
In Python's re module for regular expressions, capture groups are a fundamental feature that allows for the extraction and manipulation of specific parts of a matched string. They are created by enclosing a portion of the regular expression pattern within parentheses ().
Here's how they work:
Defining a Capture Group: Any part of a regex pattern enclosed in () becomes a capture group.
Accessing Captured Groups:
match.group(index): Retrieves the string matched by a specific capture group. index refers to the group number, starting from 1 for the first opening parenthesis. group(0) or group() returns the entire matched string.
match.groups(): Returns a tuple containing all captured subgroups as strings.
Named Capture Groups: For better readability, especially in complex patterns, named capture groups can be used with the syntax
Non-Capturing Groups: Sometimes, grouping is needed for applying quantifiers or alternation without capturing the content. This is achieved using
Capture groups are essential for tasks like parsing structured data, extracting specific information from text, and performing targeted replacements.
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