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41 .Nd regular expression handler
47 .Fn re_comp "const char *s"
49 .Fn re_exec "const char *s"
52 This interface is made obsolete by
59 compiles a string into an internal form suitable for pattern matching.
63 checks the argument string against the last string passed to
69 returns 0 if the string
71 was compiled successfully; otherwise a string containing an
72 error message is returned.
75 is passed 0 or a null string, it returns without changing the currently
76 compiled regular expression.
81 returns 1 if the string
83 matches the last compiled regular expression, 0 if the string
85 failed to match the last compiled regular expression, and \-1 if the compiled
86 regular expression was invalid (indicating an internal error).
88 The strings passed to both
92 may have trailing or embedded newline characters;
93 they are terminated by
95 The regular expressions recognized are described in the manual entry for
97 given the above difference.
102 returns \-1 for an internal error.
107 returns one of the following strings if an error occurs:
108 .Bd -unfilled -offset indent
109 No previous regular expression,
110 Regular expression too long,
113 too many \e(\e) pairs,
128 functions appeared in