checking input of textbox

This is a follow up to this ticket.¬ificationFollowed=207158836#a42554070

This is just for learning purposes, learning to work with regex.

So in the example in that ticket, how would I revise it to the following.
Either using regex or jquery or JavaScript.

Add a button called Button1.

If I type the less than sign proceded by the forwad slash sign like this </ then hide the button.
If I type the greater than sign preceded by the forwad slash sign like this /> then hide the button.
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Julian HansenCommented:
Is the button disabled if there is any /> or </ in the text
Is the button disabled only at the point that you type the > in '/>'' or the '/' in '/>'
Julian HansenCommented:
Here is a sample that works on the contains approach
<textarea class="form-control" id="tester"></textarea>
<button class="btn btn-primary" id="thebutton">Click me</button>

Open in new window

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

Open in new window

Working sample here

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maqskywalkerAuthor Commented:
Thanks! Great example!
Julian HansenCommented:
You are welcome.
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