RegExp
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     NAME
          Tcl_RegExpMatch - Test whether a string  matches  a  regular
          expression
     SYNOPSIS
          #include <tcl.h>
          int
          Tcl_RegExpMatch(interp, string, regexp)
     ARGUMENTS
          Tcl_Interp   *interp   (in)      Tcl interpreter to use  for
                                           error reporting.
          char         *string   (in)      String to test.
          char         *regexp   (in)      Regular expression to match
                                           against string.
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     DESCRIPTION
          Tcl_RegExpMatch  determines  whether  its  string   argument
          matches  regexp,  where  regexp  is interpreted as a regular
          expression using the  same  rules  as  for  the  regexp  Tcl
          command.   If  there is a match then Tcl_RegExpMatch returns
          1.  If there is no match then Tcl_RegExpMatch returns 0.  If
          an  error occurs in the matching process (e.g. regexp is not
          a valid regular expression) then Tcl_RegExpMatch returns  -1
          and leaves an error message in interp->result.
     KEYWORDS
          match, regular expression, string