不過 grepl 是回傳 TRUE 或 FALSE，
而要計算文字在句中出現次數的話，
就要使用 stringr 套件中的 str_count，
其回傳值為出現次數（數值），
下面範例可以試試看，
會比較好理解。
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| grepl("我", "我我我我我") | |
| library(stringr) | |
| str_count("我我我我我", "我") | |
| str_count(c("我我我我我", "我我"), "我") |
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