Test and Debug Code Instantly: The Best Online SQL Fiddles

Explore top SQL Fiddle engines and online compilers for Oracle. A guide to tools like rextester and dbfiddle for testing your SQL code.

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A regular expression (shortened as regex or regexp),^[1] sometimes referred to as rational expression,^[2]^[3] is a sequence of characters that specifies a match pattern in text. Usually such patterns are used by string-searching algorithms for “find” or “find and replace” operations on strings, or for input validation. Regular expression techniques are developed in theoretical computer science and formal language theory.