Fix invalid regex (fixes #159) (#163)

Author: slevithan

syntaxes/hack.json

@@ -1091,7 +1091,7 @@
           ]
         },
         {
-          "begin": "(?x)\n\\s*((?:(?:final|abstract|public|private|protected|internal|static|async)\\s+)*)\n(function)\n(?:\\s+)\n(?:\n  (__(?:call|construct|destruct|get|set|isset|unset|tostring|clone|set_state|sleep|wakeup|autoload|invoke|callStatic|dispose|disposeAsync)(?=[^a-zA-Z0-9_\\x7f-\\xff]))\n  |\n  ([a-zA-Z0-9_]+)\n)",
+          "begin": "(?x)\n\\s*((?:(?:final|abstract|public|private|protected|internal|static|async)\\s+)*)\n(function)\n(?:\\s+)\n(?:\n  (__(?:call|construct|destruct|get|set|isset|unset|tostring|clone|set_state|sleep|wakeup|autoload|invoke|callStatic|dispose|disposeAsync)(?=[^a-zA-Z0-9_\\x{7f}-\\x{ff}]))\n  |\n  ([a-zA-Z0-9_]+)\n)",
           "beginCaptures": {
             "1": {
               "patterns": [