Linux Shell Programming-Regular expressions

First, the basic regular expression

1. Regular expression: The regular expression is the string used to match the symbol condition in the file, and the Regex contains the matching

grep, awk, sed, and other commands can support regular expressions.

2. Wildcard: Used to match the qualified file name, the wildcard character is an exact match . LS, find, CP These commands do not have regular expressions,

So you can only use the shell's own wildcard character to match.

3, the basic regular expression

　　　　

　　　　

Linux Shell Programming-Regular expressions