我有以下向量。
vec <- c("1","/publications/coronavirus-covid-19-update-first-ministers-statement-11-january-2022/",
"2","/publications/coronavirus-covid-19-update-first-ministers-statement-3-august-2021-1/",
"3","/publications/coronavirus-covid-19-update-first-ministers-speech-27-july-2021/",
"4","/publications/coronavirus-covid-19-update-first-ministers-statement-20-july-2021/",
"5","/publications/coronavirus-covid-19-update-first-ministers-statement-15-june-2021/")
我想提取日期，以便獲得以下資訊；
[1] "3-august-2021" "27-july-2021" "20-july-2021" "15-june-2021"
uj5u.com熱心網友回復：
如果您不想指定月份名稱，可以使用，
\d{1,2}-\w -\d{4}
uj5u.com熱心網友回復：
您可以使用此正則運算式：
\d{1,2}-(?:january|february|march|april|may|june|july|august|september|october|november|december)-\d{4}
轉載請註明出處，本文鏈接：https://www.uj5u.com/yidong/409140.html
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