我有一个看起来像的字符串:

exampleList <- c("rs40535:1745233:G:A_AGGG","rs41111:1733320:GAC:AAC_TTTTTTG", "exm2344379:1724237:A:T_A", "exm-rs234380:1890910:A:G_A", "rs423444419_T","psy_rs73453432_TCCC","22:1701234072:C:T_C","9:4534345:rs2342342_G","chr10_rs7287862_C","psy_rs7291672_A")

我希望删除最后一个下划线 ( _ ) 之后的所有内容,因此我的结果如下所示:
[1] "rs40535:1745233:G:A"      "rs41111:1733320:GAC:AAC"  "exm2344379:1724237:A:T"   "exm-rs234380:1890910:A:G"   "rs423444419"              "psy_rs73453432"           "22:1701234072:C:T"        "9:4534345:rs2342342"     "chr10_rs7287862"          "psy_rs7291672"

我尝试了以下操作,但这会删除第一个_之后的所有内容。
gsub("\\_.*$","",exampleList)

我认识到类似的帖子,但在R中找不到。

最佳答案

弄清楚了!

outcome <- sub("_[^_]+$", "", exampleList)

10-06 05:14