# 2.11BSD#431 - /usr/man/cat3/re_comp.0

    REGEX(3)	    UNIX Programmer's Manual		 REGEX(3)

    NAME
         re_comp, re_exec - regular expression handler

    SYNOPSIS
         char *re_comp(s)
         char *s;

         re_exec(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), egrep(1), fgrep(1), grep(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 \).

    Printed 11/26/99	  May 15, 1985				1

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