R help - Jun 2006 - case insensitive regular expression

Can anybody fix the following, to match a string
disregarding case?

I tried: 
with(my.data.frame, regexpr(pattern = '(?i)J\. Test', 
  text=TARGET_COLUMN), perl=T) != -1)

R yields: invalid regular expression

with(my.data.frame, regexpr(pattern = 'J\. Test', 
  text=TARGET_COLUMN), perl=T) != -1)
works, but it does not match "J. TEST".
It does match "J. Test" correctly.

I have the feeling I'm not reading the documentation
good enough, but cannot seem to figure this out, sorry.

Thanks in advance,
JeeBee.

Found the problem already.
Without the 'with' it works, so I know where to look for the problem
now.

Thanks anyways,
JeeBee.

On Mon, 05 Jun 2006 15:16:34 +0200, JeeBee wrote:
> Can anybody fix the following, to match a string
> disregarding case?
> 
> I tried: 
> with(my.data.frame, regexpr(pattern = '(?i)J\. Test', 
>   text=TARGET_COLUMN), perl=T) != -1)
> 
> R yields: invalid regular expression
> 
> with(my.data.frame, regexpr(pattern = 'J\. Test', 
>   text=TARGET_COLUMN), perl=T) != -1)
> works, but it does not match "J. TEST".
> It does match "J. Test" correctly.
> 
> I have the feeling I'm not reading the documentation
> good enough, but cannot seem to figure this out, sorry.
> 
> Thanks in advance,
> JeeBee.