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copied!<p>Get all the files and then use <code>grep</code> to find the <code>noe</code> ones and subset them out:</p> <pre><code>> all [1] "Name_Surname_123425_xy.xls" "Name_Surname_1234445_xy.xls" [3] "Name_Surname_12345_noe_xy.xls" "Name_Surname_12345_xy.xls" [5] "Name_Surname_13245_noe_xy.xls" > all[grep("noe_xy.xls",all,invert=TRUE)] [1] "Name_Surname_123425_xy.xls" "Name_Surname_1234445_xy.xls" [3] "Name_Surname_12345_xy.xls" </code></pre> <p>always make sure you check the edge cases where all or none of the files match:</p> <pre><code>> all[grep("xls",all,invert=TRUE)] character(0) > all[grep("fnord",all,invert=TRUE)] [1] "Name_Surname_123425_xy.xls" "Name_Surname_1234445_xy.xls" [3] "Name_Surname_12345_noe_xy.xls" "Name_Surname_12345_xy.xls" [5] "Name_Surname_13245_noe_xy.xls" </code></pre> <p>Using grep with a negative index works except in these edge cases:</p> <pre><code>> all [1] "Name_Surname_123425_xy.xls" "Name_Surname_1234445_xy.xls" [3] "Name_Surname_12345_noe_xy.xls" "Name_Surname_12345_xy.xls" [5] "Name_Surname_13245_noe_xy.xls" > all[-grep("noe_xy.xls",all)] # strip out the noe_xy.xls files [1] "Name_Surname_123425_xy.xls" "Name_Surname_1234445_xy.xls" [3] "Name_Surname_12345_xy.xls" # works. Now strip out any xls files (should leave nothing) > all[-grep("xls",all)] character(0) # yup, that works too. Now strip out 'fnord' files, shouldn't remove anything: > all[-grep("fnord",all)] character(0) </code></pre> <p>Epic fail! Reason is left as an exercise to the reader.</p>

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