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Define the word regexp

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
   <>.

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]