code: function detachCustomName(ruleName) {
      ruleName = removeSpace(ruleName);
      var nameRE = /[-\w]+\(/g;
      var name = '';
  
      if(ruleName.match(nameRE)) {
          name = ruleName.match(nameRE)[0];
          name = name.substring(0, name.length - 1);
      }
  
      return name;
  }
docs: [detach custom name in rule]
  @param  {[String]} ruleName
  @return {[String]}
  
  rem(400) || rem($val) => rem