python regex match search
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Regular expressions, commonly known as regex or regexp, are powerful tools for pattern matching in strings. Python provides a re module that allows you to work with regular expressions. In this tutorial, we will explore the basics of matching and searching using Python regex with code examples.
To use regular expressions in Python, you need to import the re module.
The re.match function checks for a match only at the beginning of the string. Let's look at a simple example:
In this example, the pattern r'Hello' is searched at the beginning of the string, and if found, it prints the matched text.
The re.search function searches for a pattern throughout the entire string.
In this example, the pattern r'World' is searched anywhere in the string, and if found, it prints the matched text.
Capture groups allow you to extract specific parts of a matched pattern.
In this example, the pattern r'(\d+)-(\d+)-(\d+)' captures the year, month, and day components of a date string.
You can use flags with re.compile for case-insensitive matching.
In this example, the re.IGNORECASE flag allows the pattern to match regardless of case.
This tutorial covers the basics of Python regex matching and searching. Regular expressions provide a versatile and powerful way to work with text patterns in Python. Experiment with different patterns and explore more advanced features as needed for your specific use case.
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