The following table contains examples of extended regular expressions. A dot (.) represents the space character.
| Use this expression | If you want to match |
|---|---|
| [1-9][0-9]\{2\}-[0-9]\{4\} | A local telephone number in the United States or Canada |
| .? | Zero or one spaces |
| .+ | One or more spaces |
| March|April | March or April |
| (Mar(ch)?)|(Apr(il)?) | March, Mar, April or Apr |
| [Ss]tor(y|ies) | Story, story, Stories or stories |