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+.TH REGEX 3 deprecated
+.SH NAME
+re_comp, re_exec \(mi regular expression handler
+.SH SYNOPSIS
+.nf
+.B char *re_comp(s)
+.B char *s;
+.PP
+.B re_exec(s)
+.B char *s;
+.fi
+.SH DESCRIPTION
+.I Re_comp
+compiles a regular expression into an internal form suitable for
+pattern matching.
+.I Re_exec
+checks the argument string against the last string passed to
+.I re_comp.
+.PP
+.I Re_comp
+returns
+.L 0
+if the string
+.I s
+was compiled successfully; otherwise a string containing an
+error message is returned. If
+.I re_comp
+is passed
+.L 0
+or a null string, it returns without changing the currently
+compiled regular expression.
+.PP
+.I Re_exec
+returns 1 if the string
+.I s
+matches the last compiled regular expression,
+.L 0
+if the string
+.I s
+failed to match the last compiled regular expression, and
+.L -1
+if the compiled regular expression was invalid (indicating an
+internal error).
+.PP
+The strings passed to both
+.I re_comp
+and
+.I re_exec
+may have trailing or embedded newline characters;
+they are terminated by nulls.
+The regular expressions are otherwise as described for
+.IR ed (1).
+.SH "SEE ALSO"
+.IR ed (1), 
+.IR expr (1), 
+.IR regexp (3)
+.SH DIAGNOSTICS
+.I Re_exec
+returns
+.L -1
+for an internal error.
+.SH BUGS
+These routines have been superseded by
+the more general routines of
+.IR regexp (3).
+They have been retained only for compatibility.