On Nov 2, 2009, at 9:57 AM, Vito Muggeo (UniPa) wrote:
dear all,
This is a probably a silly question.
If I type
> grep("x",c("a.x" ,"b.x","a.xx"),value=TRUE)
[1] "a.x" "b.x" "a.xx"
> grep("\\.x\\b",c("a.x" ,"b.x","a.xx"),value=TRUE)
[1] "a.x" "b.x"
Or:
> grep("\\.x$",c("a.x" ,"b.x","a.xx"),value=TRUE)
[1] "a.x" "b.x"
Why you might ask. You need the double "\\" in order to get the
interpreter to interpret them as single escapes prior to the period
and the "\" in "\b", which is the end-of-word match pattern, while "$"
is an end of sentence pattern.
Instead, I would like to obtain only
"a.x" "b.x"
How is it possible to get this result with grep()?
many thanks for your attention,
best,
vito
--
====================================
Vito M.R. Muggeo
Dip.to Sc Statist e Matem `Vianelli'
Università di Palermo
viale delle Scienze, edificio 13
90128 Palermo - ITALY
tel: 091 6626240
fax: 091 485726/485612
http://dssm.unipa.it/vmuggeo
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