<div>
<br />
<br />
Maybe this guy can inpire you:<br />
<br />
<a href="http://osteele.com/tools/rework/" rel="ugc">http://osteele.com/tools/rework/</a><br />
<br />
<a href="http://osteele.com/tools/rework/reparse.js" rel="ugc">http://osteele.com/tools/rework/reparse.js</a>
</div>




Maybe this guy can inpire you:

http://osteele.com/tools/rework/ [http://osteele.com/tools/rework/]

http://osteele.com/tools/rework/reparse.js [http://osteele.com/tools/rework/reparse.js]

<div>
<br />
Maybe there is an easier way.... &nbsp;try using a &nbsp;&quot;try .. catch...&quot; &nbsp;block when you create the regex object:<br />
<br />
try {<br />
<br />
var re = new RegExp(document.yourFormNa<wbr />me.regexTe<wbr />xtBox.valu<wbr />e);<br />
}<br />
catch {<br />
&nbsp; alert(&quot;that's some funky regex dude.&quot;);<br />
}
</div>



Maybe there is an easier way....  try using a  "try .. catch..."  block when you create the regex object:

try {

var re = new RegExp(document.yourFormName.regexTextBox.value);
}
catch {
  alert("that's some funky regex dude.");
}

<div>
<div class="content wysiwyg-content">
I try to write a program that allow people to input an regular expression and then I will use it to excute. But If the input string is not a valide regular expression then when execute it, the executer will through error.<br />
It's not good. And I wanna check the valide of it!<br />
<br />
So please show me how to do that!<br />
Thanks so much!
</div>
</div>


I try to write a program that allow people to input an regular expression and then I will use it to excute. But If the input string is not a valide regular expression then when execute it, the executer will through error.
It's not good. And I wanna check the valide of it!

So please show me how to do that!
Thanks so much!

How to check a regular expression string is valid or not?

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.