Python regular expression findall

Regular expressions (regex or regexp) are a powerful tool for string manipulation and pattern matching in Python. The re module provides various functions to work with regular expressions, and one of the most commonly used functions is findall(). The findall() function is used to find all occurrences of a pattern in a given string. In this tutorial, we will explore the findall() function with code examples.
To use regular expressions in Python, you need to import the re module. This module provides various functions and constants for working with regular expressions.
The findall() function returns a list containing all occurrences of the pattern in the input string. Here's a basic example:
In this example, the pattern r'\b\w+at\b' looks for words ending with "at." The \b represents word boundaries, and \w+ matches one or more word characters. The result will be a list of words that end with "at."
The re.IGNORECASE flag can be used to perform a case-insensitive search. Here's an example:
The re.IGNORECASE flag is used to ignore the case while matching. In this example, both "cat" and "Cat" will be considered matches.
You can use parentheses to create groups in your pattern. The findall() function will then return a list of tuples, each containing the matched groups. Here's an example:
In this example, the pattern r'(\d{3})-(\d{3})-(\d{4})' matches phone numbers in the format XXX-XXX-XXXX, and the groups capture the area code, prefix, and line number.
The findall() function in Python's re module is a versatile tool for extracting information from strings based on patterns. It allows you to perform complex string matching and manipulation, making it an essential tool for text processing in Python. Experiment with different patterns and options to unleash the full power of regular expressions in your Python projects.
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