diff --git a/core/tests/regression_tests.rs b/core/tests/regression_tests.rs
index 57e310028..918d15a61 100644
--- a/core/tests/regression_tests.rs
+++ b/core/tests/regression_tests.rs
@@ -160,6 +160,7 @@ swf_tests! {
     (slash_syntax, "avm1/slash_syntax", 2),
     (strictequals_swf6, "avm1/strictequals_swf6", 1),
     (string_methods, "avm1/string_methods", 1),
+    (string_ops_swf6, "avm1/string_ops_swf6", 1),
     (path_string, "avm1/path_string", 1),
     (global_is_bare, "avm1/global_is_bare", 1),
     (primitive_type_globals, "avm1/primitive_type_globals", 1),
diff --git a/core/tests/swfs/avm1/string_ops_swf6/output.txt b/core/tests/swfs/avm1/string_ops_swf6/output.txt
new file mode 100644
index 000000000..c2483ed19
--- /dev/null
+++ b/core/tests/swfs/avm1/string_ops_swf6/output.txt
@@ -0,0 +1,95 @@
+// length
+// length("foo")
+3
+// mblength()
+3
+// length("")
+0
+// mblength("")
+0
+// length("😋")
+2
+// mblength("😋")
+2
+// length("😋Спасибо𝌆𝌆hello")
+18
+// mblength("😋Спасибо𝌆𝌆hello")
+18
+
+// ord("f")
+102
+// mbord("f")
+102
+// ord("bar")
+98
+// mbord("bar")
+98
+// ord(null)
+110
+// mbord(null)
+110
+// ord("愛")
+24859
+// mbord("愛")
+24859
+
+// ord("😋")
+65533
+// mbord("😋")
+65533
+// chr(80)
+P
+// mbchr(80)
+P
+// chr(12345)
+〹
+// chr(12345)
+〹
+// chr(65616)
+P
+// mbchr(65616)
+P
+// chr(-65456)
+P
+// mbchr(-65456)
+P
+// chr(0xd801)
+�
+// mbchr(0xd801)
+�
+// chr(0xabababab)
+ꮫ
+// mbchr(0xabababab)
+ꮫ
+// chr(null)
+
+// mbchr(null)
+
+// chr(true)
+

+// mbchr(true)
+

+// substring(s, 1, 2)
+😋
+// mbsubstring(s, 1, 2)
+😋
+// substring(s, 3, 1)
+航
+// mbsubstring(s, 3, 1)
+航
+// substring(s, 0, 2)
+😋
+// mbsubstring(s, 0, 2)
+😋
+// substring(s, -5, -100)
+😋航空母艦testing!
+// mbsubstring(s, -5, -100)
+😋航空母艦testing!
+// substring(s, 2, 0)
+
+// mbsubstring(s, 2, 0)
+
+// substring(s, 4294967303, -4294967294)
+te
+// mbsubstring(s, 4294967303, -4294967294)
+te
diff --git a/core/tests/swfs/avm1/string_ops_swf6/test.fla b/core/tests/swfs/avm1/string_ops_swf6/test.fla
new file mode 100644
index 000000000..c06642472
Binary files /dev/null and b/core/tests/swfs/avm1/string_ops_swf6/test.fla differ
diff --git a/core/tests/swfs/avm1/string_ops_swf6/test.swf b/core/tests/swfs/avm1/string_ops_swf6/test.swf
new file mode 100644
index 000000000..f3ad41c72
Binary files /dev/null and b/core/tests/swfs/avm1/string_ops_swf6/test.swf differ