toupper does not work in sub + regex

sub only handles replacement strings, not replacement functions.
Your code is the same as:

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

since toupper('\\1') has no alphabetics so its just literally '\\1' and
the latter is what sub uses.

The gsubfn function in the gsubfn package can deal with replacement
functions:

library(gsubfn)
gsubfn("q_([a-z])[a-zA-Z]*", toupper, "q_sviRaw")

[1] "S"

See the home page: http;//gsubfn.googlecode.com, vignette and help page.

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")

Can someone tell me where I did wrong?

Thanks,
Richard

? ? ? ?[[alternative HTML version deleted]]

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