regex - linux查找正则表达式

Question

我在使用 find 命令的正则表达式时遇到问题。可能是我不明白在命令行上转义的东西。

为什么这些不一样？

find -regex '.*[1234567890]'
find -regex '.*[[:digit:]]'

Bash、Ubuntu

Answer 1

你应该看看 find 的 -regextype 参数，见 manpage :

      -regextype type
          Changes the regular expression syntax understood by -regex and -iregex 
          tests which occur later on the command line.  Currently-implemented  
          types  are  emacs (this is the default), posix-awk, posix-basic, 
          posix-egrep and posix-extended. 

我猜 emacs 类型不支持 [[:digit:]] 构造。我尝试使用 posix-extended 并按预期工作:

find -regextype posix-extended -regex '.*[1234567890]'
find -regextype posix-extended -regex '.*[[:digit:]]'