* | Matches any number (include 0) of any characters |
? | Matches any single character |
[abcdef] | Matches a single character enclosed in square brackets |
[a-b] | Matches a single character in a range defined in square brackets |
[^abcd] | Matches a single character not enclosed in square brackets |
[[:upper:]] | Matches a single uppercase character |
[[:lower:]] | Matches a single lowercase character |
[[:digit:]] | Matches a single digit |
[[:upper:][:lower:]] | Matches a single letter |
[^[:upper:]] | Matches a single character that is not uppercase |