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I'm trying to select rows in a dataframe where the string contained in a column matches either a regular expression or a substring: dataframe: aName bName pName call alleles logRatio strength AX-11086564 F08_ADN103 2011-02-10_R10 AB CG 0.363371 10.184215 AX-11086564 A01_CD1919 2011-02-24_R11 BB GG -1.352707 9.54909 AX-11086564 B05_CD2920 2011-01-27_R6 AB CG -0.183802 9.766334 AX-11086564 D04_CD5950 2011-02-09_R9 AB CG 0.162586 10.165051 AX-11086564 D07_CD6025 2011-02-10_R10 AB CG -0.397097 9.940238 AX-11086564 B05_CD3630 2011-02-02_R7 AA CC 2.349906 9.153076 AX-11086564 D04_ADN103 2011-02-10_R2 BB GG -1.898088 9.872966 AX-11086564 A01_CD2588 2011-01-27_R5 BB GG -1.208094 9.239801 For example, I want a dataframe containing only rows that contain ADN in column bName . Secondarily, I would like all rows that contain ADN in column bName and that match 2011-02-10_R2 in column pName . I tried using functions grep() , agrep() and more but without success...
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