add PIRegularExpression

3rd/pcre2/testdata/testinput19

@@ -0,0 +1,25 @@
+# This set of tests is run only with the 8-bit library. It tests the POSIX
+# interface with UTF/UCP support, which is supported only with the 8-bit
+# library. This test should not be run with JIT (which is not available for the
+# POSIX interface).
+
+#pattern posix
+
+/a\x{1234}b/utf
+    a\x{1234}b
+
+/\w/
+\= Expect no match
+    +++\x{c2}
+
+/\w/ucp
+    +++\x{c2}
+
+/"^AB" 00 "\x{1234}$"/hex,utf
+    AB\x{00}\x{1234}\=posix_startend=0:6
+
+/\w/utf
+\= Expect UTF error
+    A\xabB
+
+# End of testdata/testinput19