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<!DOCTYPE html> <html> <head> <title> </title> </head> <body> <form id="myForm"> <fieldset> <legend>Solution 4-8: Creating custom input types using regular expressions</legend> <label> Insert a valid American Zip code: <input type="text" name="ssn" pattern="(\d{5}([\-]\d{4})?)" title="Zip Code" /> </label> <p><input type="submit" value="Check Zip code" /> </p> </fieldset> </form> </body> </html>