How to Capture Multiple Occurrences of a Subpattern in Python Regex?

Capturing Repeating Patterns with Python Regex

When matching complex patterns such as an email address, you may encounter the need to capture multiple occurrences of a specific subpattern. In Python's regular expression module, this can present a challenge.

Consider the example of matching an email address like "yasar@webmail.something.edu.tr". After matching the initial part of the email, you may wish to capture one or more occurrences of the subpattern ".(w )".

While attempting to use the expression "(.w ) ", you realized that it only captures the last match. This means you miss out on the ".something" and ".edu" groups.

In Python's regular expression module, repeated captures are not supported, even though they are in the regex standard. For this reason, capturing everything at once and then splitting the subpatterns later is a more effective approach.

Here's an example of how you could split the subpatterns after capturing the email address using a simple expression:

import re

pattern = r'([.\w]+)@((\w+)(\.\w+)+)'
match = re.match(pattern, 'yasar@webmail.something.edu.tr')

# Split the subpatterns
subpatterns = match.group(2).split('.')

# Access the subpatterns
print(subpatterns[0])  # 'webmail'
print(subpatterns[1])  # 'something'
print(subpatterns[2])  # 'edu'

This method allows you to capture and access the repeated subpatterns individually, providing a straightforward and readable solution.

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