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Validation Password or Username in Swift 4.0 Validation Tutorial Password Or Username Swift 4.0. Two type password validation. Most of the validation same confirm password , Password must one uppercase letter, Password must have more then some characters , Password contain some special character , Password must one digit. etc. Type First Password Validation -  Password Mini or Max length is 6 - 10. One Alphabet in Password. One Special Character in Password. ^                              - Start Anchor. (?=.*[a-z])               -Ensure string has one character. (?=.[$@$#!%?&])   -Ensure string has one special character. {8,}                           -Ensure password length is 8. $                               -End Anchor. See Example -   func isPasswordValidate(_ password : String)->Bool{   let validatePassword= NSPredicate(format: "SELF MATCHES %@", "^(?=.*[a-z])(?=.*[$@$#!%*?&])[A-Za-z\\d$@$#!%*?&]{8,}")     return va

Open PDF Tutorial - WKWebView in iOS Swift 4.0