如何在 Python 中使用正規表示式提取模式匹配？

Extracting Pattern Matches in Python

When utilizing regular expressions to extract specific words from a string, it's important to understand how to capture and retrieve the desired matches. In this instance, you aim to extract "my_user_name" from a given string.

As you've mentioned, you have successfully compiled a regular expression using re.compile. The next step is to use it to search for the pattern in your string. Instead of match, which checks for a match at the beginning of the string, consider using search.

import re

s = # Your long string
p = re.compile("name .* is valid")
result = p.search(s)

Assuming the search is successful (i.e., the regex finds a match in the string), you can now retrieve the captured group using group(index):

extracted_name = result.group(1)  # Index starts from 1, so this extracts "my_user_name"

In this case, group(1) will return the string that was captured within the parentheses of the regular expression. So, you will successfully extract "my_user_name" from your input string.

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