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@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.