BSD 2.11 - man page for comp (bsd section 3)
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re_comp, re_exec - regular expression handler
Re_comp compiles a string into an internal form suitable for pattern matching. Re_exec
checks the argument string against the last string passed to re_comp.
Re_comp returns 0 if the string s was compiled successfully; otherwise a string containing
an error message is returned. If re_comp is passed 0 or a null string, it returns without
changing the currently compiled regular expression.
Re_exec returns 1 if the string s matches the last compiled regular expression, 0 if the
string s failed to match the last compiled regular expression, and -1 if the compiled reg-
ular expression was invalid (indicating an internal error).
The strings passed to both re_comp and re_exec may have trailing or embedded newline char-
acters; they are terminated by nulls. The regular expressions recognized are described in
the manual entry for ed(1), given the above difference.
ed(1), ex(1), egrep(1), fgrep(1), grep(1)
Re_exec returns -1 for an internal error.
Re_comp returns one of the following strings if an error occurs:
No previous regular expression,
Regular expression too long,
too many \(\) pairs,
3rd Berkeley Distribution May 15, 1985 REGEX(3)
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