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Regular expressions
Filename expansion belongs to the shell. There is a more general and widely used tool for matching strings, called regular expressions. There are mainly three flavors:
- basic,
- extended,
- perl.
| Expression | Match |
|---|---|
. |
Matches any single character. |
* |
Matches the last character or expression 0 or more times. |
+ |
Matches the last character or expression 1 or more times. |
? |
Matches the last character or expression 0 or 1 time. |
^ |
Matches the beginning of a line. |
$ |
Match the end of a line. |
[abcde] |
Matches exactly one character listed. |
[a-e] |
Matches exactly one character in the given range. |
[^abcde] |
any character that is not listed |
[^a-e] |
any character that is not in the given range |
\ |
Escapes special characters. |
