Matchi (string, regex)

   Synopsis:
      An Axbasic pattern-matching function, comparing a Perl regular expression
         (regex) with a string to see whether the pattern matches

   Notes:
      'regex' is a Perl regular expression like "orc", "^orc" or "^orc (.*)$".
         If this pattern matches the string, Matchi () returns 1; otherwise it
         returns 0.
      Matchi () behaves just like Match (), except that for Matchi (), the
         pattern-matching operation is case insensitive (equivalent to the Perl
         expression 'm/.../i').
