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Anchors and Word Boundaries in Regex

^ and $ pin a pattern to the start and end of a string, and \b pins it to a word edge. Without them a pattern matches anywhere inside a larger string, which is why a validator that accepts 'abc123def' when it meant to accept '123' is almost always missing an anchor.

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Exact Word Matches in Python using Regex Word Boundaries \b

Word boundaries in regular expressions define a formal position separating word characters from non-word characters, functioning as anchors to ensure complete string or substring matching rather than…