[Solved] Remove text that starts with [closed]

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You could use the following regex to replace from the first - character and any characters there after.

$(".colsborder h3").each(function(){
  var str = $(this).text();
  var replaced = str.replace(/-.*/, '');
  $(this).text(replaced)
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

<div class="colsborder">
  <h3>Startoftext-needtoremove</h3>
</div>

This method would be faster than using the substring or split methods.

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solved Remove text that starts with [closed]