R字符串

sea_shells <- c(   "She","sells","sea","shells","by","the","seashore",   "The","shells","she","sells","are",surely","seashells",   "So","if","she","sells","shells","on","the","seashore",   "I'm","sure","she","sells","seashore","shells")
如何找出与某个字符串相同长度的单词，例如,长度为6的单词有shells,surely

建议加上一个tolower或者其它，不然The和the,She和she就变成了两个单词哈

1. unique(tolower(sea_shells[nchar(sea_shells)==3]))

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1. unique(sea_shells[nchar(sea_shells)==6])

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有道理，不过毕竟不是text mining，不然还要查空格。