Usually means: Pattern matching syntax for strings.
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We found 11 dictionaries that define the word regular expression:

General (4 matching dictionaries)
  1. regular expression: Oxford Learner's Dictionaries
  2. regular expression: Wiktionary
  3. regular expression: Dictionary.com
  4. Regular Expression, Regular expression: Wikipedia, the Free Encyclopedia

Computing (2 matching dictionaries)
  1. regular expression: Free On-line Dictionary of Computing
  2. regular expression: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Science (3 matching dictionaries)
  1. Regular Expression: Eric Weisstein's World of Mathematics
  2. The Computational Beauty of Nature (No longer online)
  3. regular expression: PlanetMath Encyclopedia

Slang (1 matching dictionary)
  1. regular expression: Urban Dictionary

Definitions from Wiktionary (regular expression)

noun:  (computing theory) A concise description of a regular formal language with notations for concatenation, alternation, and iteration (repetition) of subexpressions.
noun:  (computing, more generally) Any pattern for text matching or searching, frequently offering more or less functionality than a theoretical regular expression.

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