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gawk: Regexp Constants

 
 6.1.1.3 Regular Expression Constants
 ....................................
 
 A "regexp constant" is a regular expression description enclosed in
 slashes, such as '/^beginning and end$/'.  Most regexps used in 'awk'
 programs are constant, but the '~' and '!~' matching operators can also
 match computed or dynamic regexps (which are typically just ordinary
 strings or variables that contain a regexp, but could be more complex
 expressions).
 
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