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In Python, the re module provides support for regular expressions, allowing you to perform advanced string manipulations. One common use case is replacing substrings within a string using regular expressions. This tutorial will guide you through the process of using the re.sub() function for string replacement with regex in Python.
Ensure that you have the re module imported at the beginning of your script or notebook.
The re.sub() function is used to replace substrings in a string based on a regular expression pattern. The basic syntax is as follows:
Here's a simple example:
Output:
To perform a case-insensitive replacement, you can use the re.IGNORECASE flag. This is particularly useful when you want to replace substrings regardless of their case.
Output:
Regular expressions support grouping, allowing you to capture parts of the matched pattern and use them in the replacement string. Here's an example:
Output:
In this example, (\d{2}), (\d{2}), and (\d{4}) are capturing groups for day, month, and year, respectively.
Using the re.sub() function in Python, you can perform powerful string replacements with regular expressions. Experiment with different patterns and replacement strings to suit your specific needs. Regular expressions provide a flexible and efficient way to manipulate strings in complex ways.
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