Question

The address can only contain letters, numbers, % and one dash (-) all other special characters are not allowed. The single dash (-) can only be positioned between 2 numbers. The % symbol can be positioned anywhere in the address and there can be multiple occurrences of it.

Valid:   1-10 Downing Street
Valid:   Downing Street 1-10
Valid:   Downing Street
Valid:   Downing%
Valid:   %Downing Street
Valid:   %Dow%ng Street
Invalid: -10 Downing Street

I am using Java Pattern and Matcher to validate the address. Any help is greatly appreciated.

Answer 1

Try this regex:

"[%\\w][%\\w ]+( \\d+-?\\d+)?|(\\d+-?\\d+ )?[%\\w][%\\w ]+"