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Regular Expression Format Help

Parameswaran Thangavel
Ranch Hand

Joined: Mar 01, 2005
Posts: 485
I have the below requirement.
Do not allow I or O in a particular text box.

I thought of having the client side validation with the regular expression pattern.
But i am not able to figure out an expression for this.

Any help would be appreciated.

Mark Newton
Ranch Hand

Joined: Jan 31, 2006
Posts: 129
I'm no expert, but I would probably use something like:

[A-HJ-Z] <-- EDIT: ignore this, it's stupid, sorry. See my next post...

Or is that overly simple?

Two resources that I always find very useful:
Regular Expressions Cheat Sheet
Just has some handy reminders about syntax for regular expressions.

Online RegEx Tester
Tests your regular expressions, to allow you to iteratively improve them.

[ January 08, 2008: Message edited by: David Payne ]
Mark Newton
Ranch Hand

Joined: Jan 31, 2006
Posts: 129
Sorry - that was a stupid answer, and I regret it...

What about just:


This will tell you whether either I or O appears in the text box.
I agree. Here's the link:
subject: Regular Expression Format Help
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