regular expression for selection
Hi
Hi,
Try grepl instead of sub,
mena[grepl("m5.", mena)]
It does not select those "m5?" strings from those character vectors. I need as an output a vector m53, m54, m55, m56, m57, m58, m59 Regards Petr
HTH, baptiste On 14 November 2011 21:45, Petr PIKAL <petr.pikal at precheza.cz> wrote:
Dear all I am again (as usual) lost in regular expression use for selection.
Here
are my data:
dput(mena)
c("138516_10g_50ml_50c_250utes1_m53.00-_s1.imp",
"138516_10g_50ml_50c_250utes1_m54.00_s1.imp",
"138516_10g_50ml_50c_250utes1_m55.00_s1.imp",
"138516_10g_50ml_50c_250utes1_m56.00_s1.imp",
"138516_10g_50ml_50c_250utes1_m57.00_s1.imp",
"138516_10g_50ml_50c_250utes1_m58.00_s1.imp",
"138516_10g_50ml_50c_250utes1_m59.00_s1.imp")
I want to select only values "m" foolowed by numbers from 53 to 59.
I used
sub("m5.", "", mena)
which correctly selects those m53 - m59 values but, in contrary to my
expectation, it replaced the selected values with specified
replacement -
in that case empty string. What I shall use if I want to get rid of all but m53-m59 from those strings? Regards Petr
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.