--- /dev/null
+#
+# PRE: update if regex-escape
+#
+
+#
+# Strings which are expanded in a regex have regex special
+# characters escaped. Because the input strings are unsafe.
+#
+update request {
+ Tmp-String-0 := "example.com"
+ Tmp-String-1 := "^foo$bar"
+}
+
+if (&Tmp-String-0 !~ /example\.com$/) {
+ update reply {
+ Filter-Id := "fail 1"
+ }
+}
+elsif (&Tmp-String-1 !~ /\^foo\$bar/) {
+ update reply {
+ Filter-Id := "fail 1"
+ }
+} else {
+ update reply {
+ Filter-Id := "filter"
+ }
+}
\ No newline at end of file