diff --git a/BizHawk.Client.Common/BizHawk.Client.Common.csproj b/BizHawk.Client.Common/BizHawk.Client.Common.csproj
index 8a70f917ff..e4302a372d 100644
--- a/BizHawk.Client.Common/BizHawk.Client.Common.csproj
+++ b/BizHawk.Client.Common/BizHawk.Client.Common.csproj
@@ -117,6 +117,7 @@
     <Compile Include="lua\EmuLuaLibrary.Movie.cs" />
     <Compile Include="lua\EmuLuaLibrary.NES.cs" />
     <Compile Include="lua\EmuLuaLibrary.SNES.cs" />
+    <Compile Include="lua\EmuLuaLibrary.String.cs" />
     <Compile Include="lua\LuaDocumentation.cs" />
     <Compile Include="lua\LuaFile.cs" />
     <Compile Include="lua\LuaFileList.cs" />
diff --git a/BizHawk.Client.Common/lua/EmuLuaLibrary.Bit.cs b/BizHawk.Client.Common/lua/EmuLuaLibrary.Bit.cs
index c2b647cd04..96ccc88470 100644
--- a/BizHawk.Client.Common/lua/EmuLuaLibrary.Bit.cs
+++ b/BizHawk.Client.Common/lua/EmuLuaLibrary.Bit.cs
@@ -19,7 +19,6 @@ namespace BizHawk.Client.Common
 					"ror",
 					"rshift",
 					"check",
-					"signed",
 				};
 			}
 		}
diff --git a/BizHawk.Client.Common/lua/EmuLuaLibrary.String.cs b/BizHawk.Client.Common/lua/EmuLuaLibrary.String.cs
index 54796e82a2..0d60e9bca6 100644
--- a/BizHawk.Client.Common/lua/EmuLuaLibrary.String.cs
+++ b/BizHawk.Client.Common/lua/EmuLuaLibrary.String.cs
@@ -12,6 +12,14 @@ namespace BizHawk.Client.Common
 				{
 					"hex",
 					"binary",
+					"trim",
+					"replace",
+					"toupper",
+					"tolower",
+					"startswith",
+					"substring",
+					"contains",
+					"endswith",
 				};
 			}
 		}
@@ -29,6 +37,50 @@ namespace BizHawk.Client.Common
 			return binary;
 		}
 
+		public static string string_trim(object str)
+		{
+			return Convert.ToString(str);
+		}
+
+		public static string string_replace(object str, object str2, object replace)
+		{
+			return Convert.ToString(str).Replace(Convert.ToString(str2), Convert.ToString(replace));
+		}
+
+		public static string string_toupper(object str)
+		{
+			return Convert.ToString(str).ToUpper();
+		}
+
+		public static string string_tolower(object str)
+		{
+			return Convert.ToString(str).ToLower();
+		}
+
+		public static string string_substring(object str, object position, object length)
+		{
+			return Convert.ToString(str).Substring((int) position,(int) length);
+		}
+
+		public static string string_remove(object str, object position, object count)
+		{
+			return Convert.ToString(str).Remove((int) position,(int) (count));
+		}
+
+		public static bool string_contains(object str, object str2)
+		{
+			return Convert.ToString(str).Contains(Convert.ToString(str2));
+		}
+
+		public static bool string_startswith(object str, object str2)
+		{
+			return Convert.ToString(str).StartsWith(Convert.ToString(str2));
+		}
+
+		public static bool string_endswith(object str, object str2)
+		{
+			return Convert.ToString(str).EndsWith(Convert.ToString(str2));
+		}
 	}
 }
 
diff --git a/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.cs b/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.cs
index 0c369bcdc1..8ce81e4b4b 100644
--- a/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.cs
+++ b/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.cs
@@ -94,7 +94,7 @@ namespace BizHawk.Client.EmuHawk
 			new NESLuaLibrary().LuaRegister(lua, Docs);
 			new SavestateLuaLibrary().LuaRegister(lua, Docs);
 			new SNESLuaLibrary().LuaRegister(lua, Docs);
-			//new StringLuaLibrary().LuaRegister(lua, Docs);
+			new StringLuaLibrary().LuaRegister(lua, Docs);
 
 			Docs.Sort();
 		}