berkregex(3)
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berkregex, regex, recomp, reexec Subroutine
regular expression handler in DG/UX
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SYNTAX
char *recomp(s)
char *s;
reexec(s)
char *s;
DESCRIPTION
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 regular
expression was invalid (indicating an internal error).
The strings passed to both re_comp and re_exec may have trailing
or embedded newline characters; they are terminated by nulls.
The regular expressions recognized are described in the manual
entry for ed (1), given the above difference.
SEE ALSO
ed(1), ex(1)
DIAGNOSTICS
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
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berkregex(3)
Unmatched \(
Missing ]
Too many \(\) pairs
Unmatched \)
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