F
或(space)
结尾,例如"BDLL4F "
或"QCOM34F"
。我设法使用gsub()和正则表达式删除了它们。stocktickers = c("PETR4", "VALE3", "MDNE3", "BDLL4F ", "QCOM34F", "SANB11", "USIM5")
stocktickers = gsub("(.*[ F]$)","NULL",stocktickers)
stocktickers = stocktickers[stocktickers!="NULL"]
> stocktickers
[1] "PETR4" "VALE3" "MDNE3" "SANB11" "USIM5"
如果值以指定的字符或整数开头或结尾,是否有任何函数可以有条件地从数组中删除字符串?
我正在尝试从页面获取所有股票行情自动收录器/简称。但是,当我刮页面时,会出现一些不需要的代码,基本上它们都以F或(空格)结尾,例如“ BDLL4F”或“ QCOM34F” ....