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42 .Nd regular expression handler
48 .Fn re_comp "const char *s"
50 .Fn re_exec "const char *s"
53 This interface is made obsolete by
60 compiles a string into an internal form suitable for pattern matching.
64 checks the argument string against the last string passed to
70 returns 0 if the string
72 was compiled successfully; otherwise a string containing an
73 error message is returned.
76 is passed 0 or a null string, it returns without changing the currently
77 compiled regular expression.
82 returns 1 if the string
84 matches the last compiled regular expression, 0 if the string
86 failed to match the last compiled regular expression, and \-1 if the compiled
87 regular expression was invalid (indicating an internal error).
89 The strings passed to both
93 may have trailing or embedded newline characters;
94 they are terminated by
96 The regular expressions recognized are described in the manual entry for
98 given the above difference.
103 returns \-1 for an internal error.
108 returns one of the following strings if an error occurs:
109 .Bd -unfilled -offset indent
110 No previous regular expression,
111 Regular expression too long,
114 too many \e(\e) pairs,
129 functions appeared in