r - 从字符串中提取前 N 个数字

Question

我想从一些字符串中提取前两位数字。
假设数据是:

ABC Conference Room Monitor - Z5580J    
ABC 19 Monitor    
ABC 24 Monitor for Video-Conferencing
ABC UltraSharp 24 Monitor -QU2482Z

所需的输出:

55
19
24
24

Answer 1

使用正则表达式的解决方案 \\D匹配非数字字符和 \\d{2}匹配前两位数字。

as.numeric(sub("\\D*(\\d{2}).*", "\\1", INPUT))
# [1] 55 19 24 24

数据:

INPUT <- c("ABC Conference Room Monitor - Z5580J",
           "ABC 19 Monitor",
           "ABC 24 Monitor for Video-Conferencing",
           "ABC UltraSharp 24 Monitor -QU2482Z")