第一个匹配的文本词典术语我有条款 terms <- c("hello world", "great job")
terms <- as.data.frame(terms)
一本字典,我想寻找额外data.frame第一场比赛包含文件 doc <- c("i would like to say hello worlds", "hey friends hello world everyone",
我想提取Twitter的前两个单词@Handle x <- c("this is a @handle", "My name is @handle", "this string has @more than one @handle")
执行以下操作提取所有最后 @Handle只有前面的文字,我需要它的所有@处理 (ext <- stringr::str_extract_all(x, "^.*@"