berkregex(3)              DG/UX 4.30               berkregex(3)



     NAME
          berk_regex, regex, re_comp, re_exec - regular expression
          handler in DG/UX

     SYNOPSIS
          char *recomp(s)
          char *s;

          reexec(s)
          char *s;

     DESCRIPTION
          Re_comp compiles a string into an internal form suitable for
          pattern matching. Re_exec checks the argument string against
          the last string passed to re_comp.

          Re_comp returns 0 if the string s was compiled successfully;
          otherwise a string containing an error message is returned.
          If re_comp is passed 0 or a null string, it returns without
          changing the currently compiled regular expression.

          Re_exec returns 1 if the string s matches the last compiled
          regular expression, 0 if the string s failed to match the
          last compiled regular expression, and -1 if the compiled
          regular expression was invalid (indicating an internal
          error).

          The strings passed to both re_comp and re_exec may have
          trailing or embedded newline characters; they are terminated
          by nulls.  The regular expressions recognized are described
          in the manual entry for ed (1), given the above difference.

     SEE ALSO
          ed(1), ex(1)

     DIAGNOSTICS
          Re_exec returns -1 for an internal error.

          Re_comp returns one of the following strings if an error
          occurs:


               No previous regular expression
               Regular expression too long
               Unmatched \(
               Missing ]
               Too many \(\) pairs
               Unmatched \)







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