Match any single character escape sequence

Author: JoeRobich

grammars/csharp.tmLanguage

@@ -6156,7 +6156,7 @@
         <key>name</key>
         <string>constant.character.escape.cs</string>
         <key>match</key>
-        <string>\\(['"\\0abefnrtv]|x[0-9a-fA-F]{1,4}|u[0-9a-fA-F]{4})</string>
+        <string>\\(x[0-9a-fA-F]{1,4}|u[0-9a-fA-F]{4}|.)</string>
       </dict>
       <key>string-literal</key>
       <dict>
@@ -6200,7 +6200,7 @@
         <key>name</key>
         <string>constant.character.escape.cs</string>
         <key>match</key>
-        <string>\\(['"\\0abefnrtv]|x[0-9a-fA-F]{1,4}|U[0-9a-fA-F]{8}|u[0-9a-fA-F]{4})</string>
+        <string>\\(x[0-9a-fA-F]{1,4}|U[0-9a-fA-F]{8}|u[0-9a-fA-F]{4}|.)</string>
       </dict>
       <key>verbatim-string-literal</key>
       <dict>

grammars/csharp.tmLanguage.cson

@@ -3705,7 +3705,7 @@ repository:
     ]
   "char-character-escape":
     name: "constant.character.escape.cs"
-    match: "\\\\(['\"\\\\0abefnrtv]|x[0-9a-fA-F]{1,4}|u[0-9a-fA-F]{4})"
+    match: "\\\\(x[0-9a-fA-F]{1,4}|u[0-9a-fA-F]{4}|.)"
   "string-literal":
     name: "string.quoted.double.cs"
     begin: "(?<!@)\""
@@ -3725,7 +3725,7 @@ repository:
     ]
   "string-character-escape":
     name: "constant.character.escape.cs"
-    match: "\\\\(['\"\\\\0abefnrtv]|x[0-9a-fA-F]{1,4}|U[0-9a-fA-F]{8}|u[0-9a-fA-F]{4})"
+    match: "\\\\(x[0-9a-fA-F]{1,4}|U[0-9a-fA-F]{8}|u[0-9a-fA-F]{4}|.)"
   "verbatim-string-literal":
     name: "string.quoted.double.cs"
     begin: "@\""

src/csharp.tmLanguage.yml

@@ -2314,7 +2314,7 @@ repository:
 
   char-character-escape:
     name: constant.character.escape.cs
-    match: \\(['"\\0abefnrtv]|x[0-9a-fA-F]{1,4}|u[0-9a-fA-F]{4})
+    match: \\(x[0-9a-fA-F]{1,4}|u[0-9a-fA-F]{4}|.)
 
   string-literal:
     name: string.quoted.double.cs
@@ -2330,7 +2330,7 @@ repository:
 
   string-character-escape:
     name: constant.character.escape.cs
-    match: \\(['"\\0abefnrtv]|x[0-9a-fA-F]{1,4}|U[0-9a-fA-F]{8}|u[0-9a-fA-F]{4})
+    match: \\(x[0-9a-fA-F]{1,4}|U[0-9a-fA-F]{8}|u[0-9a-fA-F]{4}|.)
 
   verbatim-string-literal:
     name: string.quoted.double.cs