Question

I want to write a script which adds in a string a backslash () everytime it finds a quotation marks or \r. It works but for ” and ‘, but I don’t know how to write it for \r. Could anyone help me? THANKS

<script type="text/javascript">
var test="Let\'s test if this \"works\" properly";
var escapedString = test.replace(/(['"])/g, "\\$1");
document.write(escapedString);
</script>

Output: Let\’s test if this \”works\” properly

Answer 1

Just include the \r in your square-bracket expression.

<script type="text/javascript">
var test="Let\'s test if this \"works\" properly";
var escapedString = test.replace(/(['"\r])/g, "\\$1");
document.write(escapedString);
</script>

EDITED TO ADD EVENT-BASED INPUT SOLUTION:

Apparently what you really mean is you want to know how to add an event listener to an input and have it work on keypress.

<input type="text" onkeyup="keyUpHandler(event)"/>

And handle it like this:

function keyUpHandler(event) {
  event = event || window.event; // allowing for IE
  var kc = event.keyCode;
  var re = /[\r\n]+/;
  if kc.match(re) {
    // statements
  }
}

Try something like that. Hope this helps.