[R] regex pattern assistance

[S Ellison]

> -----Original Message-----
> > x<-"/mnt/AO/AO Data/S01-012/120824/"
> 
> I would like to extract "S01-012"


> gsub("/mnt/AO/AO Data/(.+)/.+", "\\1", x)

#does it, as does
> gsub("/mnt/AO/AO Data/([\\w-]+)/.+", "\\1", x, perl=TRUE)    # \w is perl RE; the default is POSIX, which would be. 
> gsub("/mnt/AO/AO Data/([[:alnum:]-]+)/.+", "\\1", x)  

#and
> str_match(x,"/mnt/AO/AO Data/(.+)/.+")
> str_match(x,"/mnt/AO/AO Data/([[:alnum:]-]+)/.+")   #again, needs POSIX, not perl RE

You had also, btw, missed the '.' in the closing '.+', meaning that your regex was looking for '/+', that is, multiple instances of '/'

Steve E



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