我正在使用 R 进行文本分析。有没有办法使用tm
or删除所有不在大写字母中的单词stringi
?
如果我有这样的事情
Albert Einstein went to the store and saw his friend Nikola Tesla ... + 200 pags
被转换成
Albert Einstein Nikola Tesla
此致
您可以使用简单的正则表达式删除这些单词
gsub("\\b[a-z]+\\s+", "", x)
# [1] "Albert Einstein Nikola Tesla"
这只是寻找一个单词边界>小写字母>它后面的所有字母>它后面的所有空格并将其删除
尽管如果您有诸如 之类的词don't
,您将需要更复杂的正则表达式。就像是
x <- "if Albert Einstein didn't see his friend Nikola Tesla leavin'"
gsub("\\b[a-z][^ ]*(\\s+)?", "", x)
# [1] "Albert Einstein Nikola Tesla "
只需使用grep
和一个正则表达式:
words <- 'Albert Einstein went to the store and saw his friend Nikola Tesla'
# split to vector of individual words
vec <- unlist(strsplit(words, ' '))
# just the capitalized ones
caps <- grep('^[A-Z]', vec, value = T)
# assemble back to a single string, if you want
paste(caps, collapse=' ')