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2 definitions found
 for regexp
From The Jargon File (version 4.4.7, 29 Dec 2003) :

  regexp
   /reg'eksp/, n.
  
      [Unix] (alt.: regex or reg-ex)
  
      1. Common written and spoken abbreviation for regular expression, one of
      the wildcard patterns used, e.g., by Unix utilities such as grep(1), sed(1)
      , and awk(1). These use conventions similar to but more elaborate than
      those described under glob. For purposes of this lexicon, it is
      sufficient to note that regexps also allow complemented character sets
      using ^; thus, one can specify ?any non-alphabetic character? with [^
      A-Za-z].
  
      2. Name of a well-known PD regexp-handling package in portable C, written
      by revered Usenetter Henry Spencer.
  

From The Free On-line Dictionary of Computing (18 March 2015) :

  regexp
  
     1. regular expression.
  
     2. Name of a well-known PD regexp-handling package in portable
     C, written by revered Usenetter Henry Spencer
     .
  
     [{Jargon File]
  

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