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hello and welcome to the switched xcode tutorial im cal and todays tutorial were going to be doing some validation on a form more specifically were going to be doing validation on text fields were going to be validating our email password as well as a phone number just as an example and so for the email were going to make sure that its the correct sort of syntax so that youve got some strings and that symbol some more strings are full stop and then some more strings for the password were going to make sure that its at least a certain length and that it contains at least one uppercase and lowercase character as well as containing a digit and for the phone number were going to make sure that its all digits and that its the correct length cool so lets get started so as always creating a new switch in xcode project ios app im just going to call this text field validation swift selecting storyboard and swift im going to hit next and create and then were going to head into