[R] regular expression for selection
petr.pikal at precheza.cz
Mon Nov 14 10:22:09 CET 2011
> On 11/14/2011 07:45 PM, Petr PIKAL wrote:
> > Dear all
> > I am again (as usual) lost in regular expression use for selection.
> > 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
> > in that case empty string.
> > What I shall use if I want to get rid of all but m53-m59 from those
> > strings?
> Hi Petr,
> How about:
It gives numeric values which tells me that there is a match in each
string, but as a result I need only
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