| RE_COMP(3) | Library Functions Manual | RE_COMP(3) |
re_comp, re_exec —
#include <re_comp.h>
char *
re_comp(const
char *s);
int
re_exec(const
char *s);
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.
re_exec() function returns -1 for an internal error.
The re_comp() function returns one of the
following strings if an error occurs:
No previous regular expression, Regular expression too long, unmatched \(, missing ], too many \(\) pairs, unmatched \).
re_comp() and re_exec()
functions appeared in 4.0BSD.
| June 4, 1993 | NetBSD 9.4 |