Web Reference: Jul 12, 2025 · This article demonstrates how to use regex to substitute patterns by providing multiple examples where each example is a unique scenario in its own. It is very necessary to understand the re.sub() method of re (regular expression) module to understand the given solutions. The answer proposed by @nhahtdh is valid, but I would argue less pythonic than the canonical example, which uses code less opaque than his regex manipulations and takes advantage of python's built-in data structures and anonymous function feature. 1 day ago · It provides a gentler introduction than the corresponding section in the Library Reference. Introduction ¶ Regular expressions (called REs, or regexes, or regex patterns) are essentially a tiny, highly specialized programming language embedded inside Python and made available through the re module.
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