JavaScript: Functions to Escape / Unescape Using _ instead of %

Posted on 2013-11-06
Medium Priority
Last Modified: 2013-11-06
I want JavaScript functions that will work just like escape() and unescape() that use an underscore instead of a percent.

My function below does not work, as the example demonstrates:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<meta charset="utf-8" />

<script type="text/javascript">

var x = 'Hello_World "123%"';

x = escapeu(x);

x = unescapeu(x);

function escapeu(str) {
 return escape(str).replace(/%/g, '_' );

function unescapeu(str) {
 return unescape(str.replace(/_/g, '%' ));


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Question by:hankknight
  • 2
LVL 83

Expert Comment

ID: 39628743
what about :
function escapeu(str) {
 return escape(str).replace(new RegExp(escape("%"),"g"), escape('_'));

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test page : http://jsfiddle.net/3fp6c/2/
LVL 16

Author Comment

ID: 39628869
That does not do the trick.

Please test this:
LVL 83

Accepted Solution

leakim971 earned 2000 total points
ID: 39628914
check this one : http://jsfiddle.net/6WHaM/1/

var x = 'Hello___World "123%"';
alert('The fist and last line should be the same:\n\n'+x+'\n'+escapeu(x)+'\n'+unescapeu(escapeu(x)));

function escapeu(str) {
 return escape(str).replace(/_/g,"%5F").replace(/%/g,"_");

function unescapeu(str) {
 return unescape(str.replace(/_/g,"%"));

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