[R] regular expression for selection

Petr PIKAL petr.pikal at precheza.cz
Mon Nov 14 09:45:18 CET 2011

Dear all

I am again (as usual) lost in regular expression use for selection. Here 
are my data:

> dput(mena)

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 


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