[LON-CAPA-users] regular expression

Gerd Kortemeyer lon-capa-users@mail.lon-capa.org
Tue, 16 Aug 2005 10:21:46 -0400


Why not use formula response instead of string?

On Aug 16, 2005, at 8:48 AM, H. K. Ng wrote:

> Hi,
>
> Is there a way to construct the following regular expression? I  
> want the students to enter number1/(number2 * x) where number1 and  
> number2 are known integers. However, number2 can be 1, so that  
> means they can enter as number1/x and also, number1/(x) or number1/ 
> (1*x). Question: For the last 2 answers, what I like to check is,  
> if they type the left parenthesis '(' then they need to enter the  
> right parenthesis ')'. I look in the Mastering Regular Expressions  
> book but could not find any info on how to check for an character.
>
> Thanks,
> -hk
>
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