根据条件从向量中提取一些元素

Question

输入向量将是

in <- c("Aone1","BZtwo2","AZtwenty4Btwo5","Cthirty22HIfour9")

我需要最终输出为

out <- c("one","two","twenty","two","thirty","four")  

提取基于大写字母和数字之间的小写字母。

Answer 1

您是否只想提取字符串的小写部分？如果是这样，请尝试：

v1 <- c("Aone1", "BZtwo2", "AZtwenty4Btwo5", "Cthirty22HIfour9")
regmatches(v1, gregexpr("[a-z]+", v1))
# [[1]]
# [1] "one"
# 
# [[2]]
# [1] "two"
# 
# [[3]]
# [1] "twenty" "two"   
# 
# [[4]]
# [1] "thirty" "four" 

如果您想获得单个字符向量而不是unlist()，请在list中包含上述内容。