tail head cat sleep
QR code linking to this page

Manual Pages  — RE_COMP

NAME

re_comp, re_exec – regular expression handler

CONTENTS

LIBRARY

Compatibility Library (libcompat, -lcompat)

SYNOPSIS

#include <unistd.h>

char *
re_comp(const char *s);

int
re_exec(const char *s);

DESCRIPTION

This interface is made obsolete by regex(3).

The re_comp() function compiles a string into an internal form suitable for pattern matching. The re_exec() function checks the argument string against the last string passed to re_comp().

The re_comp() function 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.

The re_exec() function 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 NULs. The regular expressions recognized are described in the manual entry for ed(1), given the above difference.

DIAGNOSTICS

The re_exec() function returns -1 for an internal error.

The re_comp() function returns "no previous regular expression" or one of the strings generated by regerror(3).

SEE ALSO

ed(1), egrep(1), ex(1), fgrep(1), grep(1), regex(3)

HISTORY

The re_comp() and re_exec() functions appeared in BSD 4.0 .

RE_COMP (3) June 4, 1993

tail head cat sleep
QR code linking to this page


Please direct any comments about this manual page service to Ben Bullock. Privacy policy.

Some people open all the windows; wise wives welcome spring by moving the UNIX.