Check if a string contains at least a upperCase letter, a digit, or a special character in Swift?

Simply replace your RegEx rule [A-Z]+ with .*[A-Z]+.* (and other RegEx rules as well)

Rules

[A-Z]+ matches only strings with all characters capitalized

Examples: AVATAR, AVA, TAR, AAAAAA
Won't work: AVATAr

.* matches all strings (0+ characters)

Examples: 1, 2, AVATAR, AVA, TAR, a, b, c

.*[A-Z]+.* matches all strings with at least one capital letter

Examples: Avatar, avataR, aVatar

Explanation:

I. .* will try to match 0 or more of anything
II. [A-Z]+ will require at least one capital letter (because of the +)
III. .* will try to match 0 or more of anything

Avatar [empty | "A" | "vatar"]
aVatar ["a" | "V" | "atar"]
aVAtar ["a" | "VA" | "tar"]

Working Code

func checkTextSufficientComplexity(var text : String) -> Bool{    let capitalLetterRegEx  = ".*[A-Z]+.*"    var texttest = NSPredicate(format:"SELF MATCHES %@", capitalLetterRegEx)    var capitalresult = texttest!.evaluateWithObject(text)    println("\(capitalresult)")    let numberRegEx  = ".*[0-9]+.*"    var texttest1 = NSPredicate(format:"SELF MATCHES %@", numberRegEx)    var numberresult = texttest1!.evaluateWithObject(text)    println("\(numberresult)")    let specialCharacterRegEx  = ".*[!&^%$#@()/]+.*"    var texttest2 = NSPredicate(format:"SELF MATCHES %@", specialCharacterRegEx)    var specialresult = texttest2!.evaluateWithObject(text)    println("\(specialresult)")    return capitalresult || numberresult || specialresult}

Examples:

checkTextSufficientComplexity("Avatar") // true || false || falsecheckTextSufficientComplexity("avatar") // false || false || falsecheckTextSufficientComplexity("avatar1") // false || true || falsecheckTextSufficientComplexity("avatar!") // false || false || true

Here is a concise version of Joshuas answer in Swift 3, assuming that all validations must be fulfilled.

func validate(password: String) -> Bool {    let capitalLetterRegEx  = ".*[A-Z]+.*"    let texttest = NSPredicate(format:"SELF MATCHES %@", capitalLetterRegEx)    guard texttest.evaluate(with: password) else { return false }    let numberRegEx  = ".*[0-9]+.*"    let texttest1 = NSPredicate(format:"SELF MATCHES %@", numberRegEx)    guard texttest1.evaluate(with: password) else { return false }    let specialCharacterRegEx  = ".*[!&^%$#@()/_*+-]+.*"    let texttest2 = NSPredicate(format:"SELF MATCHES %@", specialCharacterRegEx)    guard texttest2.evaluate(with: password) else { return false }    return true}

Another alternate solution.

You can do all the check using one regular expression.

RegExp: ^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[$@$!%*?&])[A-Za-z\\d$@$!%*?&]{8,}

You can use this as mention below:

//Minimum 8 characters at least 1 Uppercase Alphabet, 1 Lowercase Alphabet, 1 Number and 1 Special Character:let regex = "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[$@$!%*?&])[A-Za-z\\d$@$!%*?&]{8,}"let isMatched = NSPredicate(format:"SELF MATCHES %@", regex).evaluate(with: yourTextField.text)if(isMatched  == true) {    // Do your stuff ..}  else {    // Show Error Message.}