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in python, the re module provides powerful tools for working with regular expressions. regular expressions allow you to search, match, and manipulate strings based on specific patterns. one common use case is string replacement, where you replace occurrences of a particular pattern with another string. in this tutorial, we'll explore how to perform string replacement using regular expressions in python.
to get started, you need to import the re module, which provides functions for working with regular expressions.
the re.sub() function is the primary method for string replacement using regular expressions. it takes three arguments: the pattern to search for, the replacement string, and the input string.
output:
in this example, every occurrence of the pattern "hello" in the input_string is replaced with the string "hi".
if you want to perform case-insensitive replacement, you can use the re.ignorecase flag.
output:
the re.ignorecase flag ensures that the pattern matching is case-insensitive.
capture groups allow you to capture parts of the matched pattern and use them in the replacement string. you define capture groups by enclosing the relevant

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