• A sequence of characters that define a search pattern. Usually such patterns are used by string searching algorithms for “find” or “find and replace” operations on strings, or for input validation. Regular expressions are a technique developed in theoretical computer science and formal language theory. They are used in search engines, “search and replace” dialogs of word processors and text editors, in text processing utilities such as sed and awk, and in lexical analysis. Many programming languages provide regex capabilities either built-in or via libraries. ← Wikipedia

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