working with regular expressions and jquery

This is a followup to the example in this ticket.
https://www.experts-exchange.com/questions/29098002/checking-input-of-textbox.html?anchor=a42554823

I created the example in this fiddle.
https://jsfiddle.net/2edzjg0x/1/

In this fiddle example this is what it looks like when you run it.
Notice the button is disabled. The textbox gets validated to see if user typed a less than sign < or greater than sign >

on run

I'm using a regular expression to check for a less than sign < or greater than sign > in the textbox.

If user types this < then they get this message:

S2p2.PNG
If user types this > then they get this message:

  S2p4.PNG
If they type in regular text, validation passes and the button becomes enabled.

S2p3.PNG


In this example fiddle I'm using a regular expression , I'm learning to work with regular expresssions.

How do I revise my fiddle example to check for what the example in this ticket does:

https://www.experts-exchange.com/questions/29098002/checking-input-of-textbox.html?anchor=a42554823

That ticket example test this:

  $('#tester').keyup(function() {
    var disabled = $(this).val().indexOf('/>') > 0 || $(this).val().indexOf('</') > 0;
    $('#thebutton').prop({disabled: disabled});
  });

What is the equivalient of this:  var disabled = $(this).val().indexOf('/>') > 0 || $(this).val().indexOf('</') > 0;

Using a regular expression?
S2p4.PNG
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maqskywalkerAsked:
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Miguel OzSoftware EngineerCommented:
Regular expression to detect <  and >: [<>])
  var value = $(this).val();
  var regextest = new RegExp('[<>]');
  var disabled = regextest.test(value);

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