match 5 digit number
^[0-9]{5}$
match any number
^[0-9]+$
do not match numbers
^[^0-9]+$
match phone number with optional dashes. e.g. 850-555-2345
^[0-9]{3}-?[0-9]{3}-?[0-9]{4}$
match an email. e.g. [email protected]
^[a-zA-Z0-9._-]+@[a-zA-Z0-9]+\.[a-zA-Z]{2,3}$
^[\w\d._-]+@[\w\d]+\.[\w]{2,3}$
\w and \d also match numbers in foreign languages and little bit more