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| (Expression OR)

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Use the | when either one expression or another will do.

For example:

Both the expressions '(Dave|David) Vest' and 'Dav(e|id) Vest' will match 'Dave Vest' and 'David Vest'

'(1|2|3) (person|people)' will match '1 person' and '2 people' and '3 people' but will not match '4 people' (it will also match '2 person' etc.). Note: this expression could have also been expressed using a character list.