How Can You Capture Repeating Subpatterns in Python Regex?

Matching and Capturing Repeating Subpatterns in Python Regex

When matching complex patterns like email addresses, it is often necessary to capture repeating subpatterns. For instance, in an email address like "yasar@webmail.something.edu.tr," we need to capture the domain parts ".something" and ".edu." Regex provides a way to do this through repeated capturing groups. However, the Python re module does not fully support it.

Option 1: Using Python's re Module

If you try to use a pattern like (.w ) with re, it will capture only the last matching group instead of all occurrences. For example, with [email protected], it would only capture ".tr" and miss ".something" and ".edu."

Option 2: Splitting and Matching Later

As suggested by the answer provided, a more straightforward approach in Python is to match everything at first and then split the captured subpatterns using string manipulation. This can be easier to read and implement. For instance:

import re

# Match the entire email address
email_pattern = re.compile(r'([^\s@]+)@(\w+\.\w+)')
match = email_pattern.match('[email protected]')
if match:
    # Split the domain portion
    domain = match.group(2)
    domain_parts = domain.split('.')
    print('Domain Parts:', domain_parts)

This code captures the entire email address and then splits the domain into its parts, allowing us to access and store each subpattern separately.

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