We really like the @-fomula language's ability to pull out part of a string based on another string. For example, @Right("Hello", "e") returns "llo". In JavaScript, you have to use offsets.

Here are a few JavaScript functions to mimic the @-function capabilities.

function rightString(fullString, subString) {
   if (fullString.indexOf(subString) == -1) {
      return "";
   } else {
      return (fullString.substring(fullString.indexOf(subString)+subString.length, fullString.length));
   }
}


function rightBackString(fullString, subString) {
   if (fullString.lastIndexOf(subString) == -1) {
      return "";
   } else {
      return fullString.substring(fullString.lastIndexOf(subString)+1, fullString.length);
   }
}


function middleString(fullString, startString, endString) {
   if (fullString.indexOf(startString) == -1) {
      return "";
   } else {
      var sub = fullString.substring(fullString.indexOf(startString)+startString.length, fullString.length);
      if (sub.indexOf(endString) == -1) {
         return sub;
      } else {
         return (sub.substring(0, sub.indexOf(endString)));
      }
   }
}


function middleBackString(fullString, startString, endString) {
   if (fullString.lastIndexOf(startString) == -1) {
      return "";
   } else {
      var sub = fullString.substring(0, fullString.lastIndexOf(startString));
      if (sub.indexOf(endString) == -1) {
         return sub;
      } else {
         return (sub.substring(sub.indexOf(endString)+endString.length, sub.length));
      }
   }
}


function leftString(fullString, subString) {
   if (fullString.indexOf(subString) == -1) {
      return "";
   } else {
      return (fullString.substring(0, fullString.indexOf(subString)));
   }
}


function leftBackString(fullString, subString) {
   if (fullString.lastIndexOf(subString) == -1) {
      return "";
   } else {
      return fullString.substring(0, fullString.lastIndexOf(subString));
   }
}