r - Get specific part of a string for each line -


i have data want take specific part of 

    doseresponse_curves/drcurve_aaatt.pdf     doseresponse_curves/drcurve_agmk1.pdf     doseresponse_curves/drcurve_agu.pdf     doseresponse_curves/drcurve_alh1l2.pdf     doseresponse_curves/drcurve_alkb1.pdf     doseresponse_curves/drcurve_as2.pdf     doseresponse_curves/drcurve_ank1.pdf     doseresponse_curves/drcurve_ankrd54.pdf

i want take whatever comes after second _ , before . means output looks this

aaatt  agmk1 agu alh1l2 alkb1 as2 ank1 ankrd54

note: working gene names, can contain characters such c(".", "-").

you can sub , regular expression. 

files = c(     'doseresponse_curves/drcurve_aaatt.pdf',     'doseresponse_curves/drcurve_agmk1.pdf',     'doseresponse_curves/drcurve_agu.pdf',     'doseresponse_curves/drcurve_alh1l2.pdf',     'doseresponse_curves/drcurve_alkb1.pdf',     'doseresponse_curves/drcurve_as2.pdf',     'doseresponse_curves/drcurve_ank1.pdf',     'doseresponse_curves/drcurve_ankrd54.pdf')  sub(".*?_.*?_(.*?)\\..*", "\\1", files) [1] "aaatt"   "agmk1"   "agu"     "alh1l2"  "alkb1"   "as2"     "ank1"    [8] "ankrd54"

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