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Definition of Regular expression
1. Noun. (computing theory) A concise description of a regular formal language with notations for concatenation, alternation, and iteration (repetition) of subexpressions. ¹
2. Noun. (computing more generally) Any pattern for text matching or searching, frequently offering more or less functionality than a theoretical regular expression. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Regular Expression
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