How to Extract Text Between Strings Using Regular Expressions in Python?

Matching Text Between Strings Using Regular Expressions

To extract text between two specific strings in a given piece of text, regular expressions provide a powerful tool. In particular, Python's re module can be leveraged to perform this task efficiently.

For example, given the following text:

Part 1. Part 2. Part 3 then more text

To isolate the text between "Part 1" and "Part 3", we could construct a regular expression as follows:

<code class="python">import re
pattern = r'Part 1\.(.*?)Part 3'</code>

In this expression, "Part 1.(*?)Part 3" matches any character sequence (.*?) that appears between "Part 1" and "Part 3".

Using the re.search function, we can execute the search:

<code class="python">match = re.search(pattern, text)
if match:
    result = match.group(1)</code>

The re.search function returns a Match object if a match is found. We access the captured text using the group(1) method, which retrieves the contents of the first capture group (which corresponds to the text between "Part 1" and "Part 3").

Output:

>>> print(result)
Part 2.

This approach allows for a flexible and precise way to extract text between two specific strings using regular expressions, making it a robust solution for various text processing scenarios.

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