本文介绍了从字符串向量中获取子字符串的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个字符串向量
ids <- c("NM_006690.2_PROBE1","333212.1_PROBE1","7602049CB1_PROBE1","NM_018065.1_PROBE1","1539036CB1_PROBE1","NM_021019.1_PROBE1","1440608CB1_PROBE1","NM_031270.1_PROBE1","613678CB1_PROBE1")
这里已经有很多讨论了:提取子串在 R 根据模式.
A lot of discussing is already here: extract a substring in R according to a pattern.
我想删除 dot(.) 之后的所有内容，并希望删除 PROBE 之前的 _ 之后的所有内容.我设法通过
I want to remove everything after a dot(.) and want to remove all after _ before PROBE. i managed to remove . by
read.table(text = ids, sep = ".", as.is = TRUE, fill=TRUE)$V1
我现在介意在像 613678CB1_PROBE1 这样的情况下删除 PROBE 之前的 _ 并且我想要的输出是 613678CB1 .怎么做.
I now mind to remove the _ before PROBE in cases like 613678CB1_PROBE1 and the output i want is 613678CB1 . How to do it.
输出:
"NM_006690", "333212" , "7602049CB1" "NM_018065","1539036CB1" "NM_021019" "1440608CB1" "NM_031270","613678CB1")
注意:有两个_，一个用NM，另一个用PROBE.我希望删除所有内容 _PROBE
Note: There are two _'s one attached with NM and other with PROBE. I want the one every thing to be removed _PROBE
推荐答案
你好像在问:
gsub("\\..*|_PROBE.*", "", ids)
演示:
gsub("\\..*|_PROBE.*", "", ids)
# [1] "NM_006690" "333212" "7602049CB1" "NM_018065" "1539036CB1"
# [6] "NM_021019" "1440608CB1" "NM_031270" "613678CB1"
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