Python regexp module re
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Regular expressions (regex or regexp) are powerful tools for pattern matching and text manipulation. Python provides a built-in module called re that allows you to work with regular expressions. In this tutorial, we will explore the basics of the re module, its functions, and provide practical examples to help you master regular expressions in Python.
Regular expressions are sequences of characters that define a search pattern. They are widely used for string manipulation tasks, such as searching, matching, and replacing substrings. Regular expressions provide a concise and flexible way to describe complex patterns in text.
To use the re module, you need to import it:
The re module provides several functions for working with regular expressions, including:
The re.match() function checks for a match only at the beginning of the string. If the pattern is found, it returns a match object; otherwise, it returns None.
The re.search() function searches the entire string for a match and returns the first occurrence found.
The re.findall() function returns a list of all occurrences of the pattern in the string.
The re.split() function splits the string at each occurrence of the pattern.
The re.sub() function replaces occurrences of the pattern with a specified string.
Regular expression patterns consist of a combination of characters and special symbols that define the search criteria. Here are some common elements:
