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28 .\" @(#)re_comp.3 8.1 (Berkeley) 6/4/93
37 .Nd regular expression handler
43 .Fn re_comp "const char *s"
45 .Fn re_exec "const char *s"
48 This interface is made obsolete by
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.
71 is passed 0 or a null string, it returns without changing the currently
72 compiled regular expression.
77 returns 1 if the string
79 matches the last compiled regular expression, 0 if the string
81 failed to match the last compiled regular expression, and \-1 if the compiled
82 regular expression was invalid (indicating an internal error).
84 The strings passed to both
88 may have trailing or embedded newline characters;
89 they are terminated by
91 The regular expressions recognized are described in the manual entry for
93 given the above difference.
98 returns \-1 for an internal error.
103 returns one of the following strings if an error occurs:
104 .Bd -unfilled -offset indent
105 No previous regular expression,
106 Regular expression too long,
109 too many \e(\e) pairs,
124 functions appeared in