[R] toupper does not work in sub + regex

[Tan, Richard]

Thanks, Martin.  I did not realize that.  I never used perl compatible
regex before but seems now I should!

Richard

-----Original Message-----
From: Martin Morgan [mailto:mtmorgan at fhcrc.org] 
Sent: Monday, April 13, 2009 12:08 PM
To: Tan, Richard
Subject: Re: [R] toupper does not work in sub + regex

"Tan, Richard" <RTan at panagora.com> writes:

> Hi, I don't know what I am doing wrong to the toupper does not seem 
> working in sub + regex.  The following returns 's' not the upper class

> 'S' as I expect:
>  
> sub("q_([a-z])[a-zA-Z]*",toupper('\\1'),"q_sviRaw")

you're expecting toupper to be evaluated after substitution, but it is
evaluated before: toupper('\\1') ==> '\\1'. try

  sub("q_([a-z])[a-zA-Z]*",'\\U\\1',"q_sviRaw", perl=TRUE)

  
> Can someone tell me where I did wrong?
>  
> Thanks,
> Richard
>
> 	[[alternative HTML version deleted]]
>
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--
Martin Morgan
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