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Thanks for inputs, that should do it.
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I need this to allow uppercase caps only, with a blank entry required. &nbsp;<br />
<br />
&quot;^[A-Z]{0,1}&quot;<br />
<br />
But it seems to give error if the entry field is blank. &nbsp; <br />
<br />
Any suggestions on this would be welcome<br />
<br />
Thanks!
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I need this to allow uppercase caps only, with a blank entry required.  

"^[A-Z]{0,1}"

But it seems to give error if the entry field is blank.   

Any suggestions on this would be welcome

Thanks!

Regular Expression

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.