Useful for searching & replacing discrete patterns of text.
The search pattern can include 'character classes', which you can define yourself by enclosing the stuff you're searching for in [ ]s.
| Class | Matches |
| [a-zA-Z] | any letter |
| [a-zA-Z0-9] | any combo of letters & numbers |
| [\-] | an actual dash |
| . | anything |
| \. | an actual dot |
| ^ | start of line |
| $ | end of line |
| + | one or more of the preceding |
| * | zero or more of the preceding |
- some examples would be nice