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diff --git a/man3/regex.3 b/man3/regex.3
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@@ -301,6 +301,25 @@ The regex routines ran out of memory.
.TP
.B REG_ESUBREG
Invalid back reference to a subexpression.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbw20 lb lb
+l l l.
+Interface Attribute Value
+T{
+.BR regcomp (),
+.BR regexec ()
+T} Thread safety MT-Safe locale
+T{
+.BR regerror ()
+T} Thread safety MT-Safe env
+T{
+.BR regfree ()
+T} Thread safety MT-Safe
+.TE
.SH CONFORMING TO
POSIX.1-2001.
.SH SEE ALSO