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regexp

   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 <henry@zoo.toronto.edu>.