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Asked: 2026-05-10T16:39:14+00:00

I’ve got a function that runs a user generated Regex. However, if the user

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I’ve got a function that runs a user generated Regex. However, if the user enters a regex that won’t run then it stops and falls over. I’ve tried wrapping the line in a Try/Catch block but alas nothing happens.

If it helps, I’m running jQuery but the code below does not have it as I’m guessing that it’s a little more fundamental than that.

Edit: Yes, I know that I am not escaping the ‘[‘, that’s intentional and the point of the question. I’m accepting user input and I want to find a way to catch this sort of problem without the application falling flat on it’s face.

<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Strict//EN'     'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd'> <html> <head>     <title>Regex</title>      <script type='text/javascript' charset='utf-8'>         var grep = new RegExp('gr[');          try         {             var results = grep.exec('bob went to town');         }         catch (e)         {             //Do nothing?         }          alert('If you can see this then the script kept going');     </script> </head> <body>  </body> </html>
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1 Answer

  1. Try this the new RegExp is throwing the exception

    Regex

        <script type='text/javascript' charset='utf-8'>             var grep;              try {                     grep = new RegExp('gr[');             }             catch(e) {                     alert(e);              }             try             {                     var results = grep.exec('bob went to town');             }             catch (e)             {                     //Do nothing?             }              alert('If you can see this then the script kept going');     </script>

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