Issue 6823 - Remove unnecessary usage of /u flag

lib/snippets.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 111 matching lines @@
         argument += singleCharacterEscapes.get(character) || character;
     }
     else if (character == "\\")
     {
       escape = true;
     }
     else if (character == "'")
     {
       withinQuotes = !withinQuotes;
     }
-    else if (withinQuotes || character != ";" && !/\s/u.test(character))
+    else if (withinQuotes || character != ";" && !/\s/.test(character))
     {
       argument += character;
     }
     else
     {
       if (argument)
       {
         call.push(argument);
         argument = "";
       }
@@ skipping 37 matching lines @@
           let value = imports[name];
           if (typeof value == "function")
             value(...args);
         }
       }
     }
   `;
 }
 
 exports.compileScript = compileScript;