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32 .\" @(#)re_comp.3 8.1 (Berkeley) 6/4/93
40 .Nd regular expression handler
42 .Fd #include <unistd.h>
44 .Fn re_comp "const char *s"
46 .Fn re_exec "const char *s"
48 This interface is made obsolete by
50 It is available from the compatibility library, libcompat.
55 compiles a string into an internal form suitable for pattern matching.
59 checks the argument string against the last string passed to
65 returns 0 if the string
67 was compiled successfully; otherwise a string containing an
68 error message is returned. If
70 is passed 0 or a null string, it returns without changing the currently
71 compiled regular expression.
76 returns 1 if the string
78 matches the last compiled regular expression, 0 if the string
80 failed to match the last compiled regular expression, and \-1 if the compiled
81 regular expression was invalid (indicating an internal error).
83 The strings passed to both
87 may have trailing or embedded newline characters;
88 they are terminated by
90 The regular expressions recognized are described in the manual entry for
92 given the above difference.
97 returns \-1 for an internal error.
102 returns one of the following strings if an error occurs:
103 .Bd -unfilled -offset indent
104 No previous regular expression,
105 Regular expression too long,
108 too many \e(\e) pairs,
123 functions appeared in