Test against a regression with accepted filenames

tests/ParsingT.cpp

@@ -621,3 +621,34 @@ R"(#define $B foo-$A-baz
         REQUIRE(mock.fullBlockHeaders == expectedHeaders);
         REQUIRE(mock.fullBlockMembers == expectedMembers);
 }
+
+TEST_CASE("[Parsing] Opcode value special character")
+{
+        sfz::Parser parser;
+        ParsingMocker mock;
+        parser.setListener(&mock);
+        parser.parseString("/opcodeValueSpecialCharacter.sfz",
+R"(<region>
+sample=Alto-Flute-sus-C#4-PB-loop.wav)");
+
+        std::vector<std::vector<sfz::Opcode>> expectedMembers = {
+            {{"sample", "Alto-Flute-sus-C#4-PB-loop.wav"}},
+        };
+        std::vector<std::string> expectedHeaders = {
+            "region"
+        };
+        std::vector<sfz::Opcode> expectedOpcodes;
+
+        for (auto& members: expectedMembers)
+            for (auto& opcode: members)
+                expectedOpcodes.push_back(opcode);
+
+        REQUIRE(mock.beginnings == 1);
+        REQUIRE(mock.endings == 1);
+        REQUIRE(mock.errors.empty());
+        REQUIRE(mock.warnings.empty());
+        REQUIRE(mock.opcodes == expectedOpcodes);
+        REQUIRE(mock.headers == expectedHeaders);
+        REQUIRE(mock.fullBlockHeaders == expectedHeaders);
+        REQUIRE(mock.fullBlockMembers == expectedMembers);
+}