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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
50 It is available from the compatibility library, libcompat.
56 compiles a string into an internal form suitable for pattern matching.
60 checks the argument string against the last string passed to
66 returns 0 if the string
68 was compiled successfully; otherwise a string containing an
69 error message is returned.
72 is passed 0 or a null string, it returns without changing the currently
73 compiled regular expression.
78 returns 1 if the string
80 matches the last compiled regular expression, 0 if the string
82 failed to match the last compiled regular expression, and \-1 if the compiled
83 regular expression was invalid (indicating an internal error).
85 The strings passed to both
89 may have trailing or embedded newline characters;
90 they are terminated by
92 The regular expressions recognized are described in the manual entry for
94 given the above difference.
99 returns \-1 for an internal error.
104 returns one of the following strings if an error occurs:
105 .Bd -unfilled -offset indent
106 No previous regular expression,
107 Regular expression too long,
110 too many \e(\e) pairs,
125 functions appeared in