正则表达式 – 从字符串中提取匹配的单词
发布时间:2020-12-14 06:00:03 所属栏目:百科 来源:网络整理
导读:我有一个数据库结构 – 下面的缩写版本 structure(list(sex1 = c("totalmaleglobal","totalfemaleglobal","totalglobal","totalfemaleGSK","totalfemaleUN")),.Names = "sex1",row.names = c(NA,6L),class="data.frame") 我想提
我有一个数据库结构 – 下面的缩写版本
structure(list(sex1 = c("totalmaleglobal","totalfemaleglobal","totalglobal","totalfemaleGSK","totalfemaleUN")),.Names = "sex1",row.names = c(NA,6L),class="data.frame") 我想提取’total’,’totalmale’,’totalfemale’这个词 怎么办? 我用以下代码尝试了正则表达式 pattern1=c("total") pattern2=c("totalmale") pattern3=c("totalfemale") daly$sex <- str_extract(daly$sex1,pattern1) daly$sex <- str_extract(daly$sex1,pattern2) daly$sex <- str_extract(daly$sex1,pattern3) 但它给了我NA. 解决方法
也许
library(stringr) daly$sex <- str_extract(daly$sex1,paste(rev(mget(ls(pattern = "patternd+"))),collapse="|")) daly # sex1 sex # 1 totalmaleglobal totalmale # 2 totalfemaleglobal totalfemale # 3 totalglobal total # 4 totalfemaleGSK totalfemale # 5 totalfemaleglobal totalfemale # 6 totalfemaleUN totalfemale (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |