Validate email and password

[tatsuyamoriguchi]

• Prohibit entry of nil
• non-email format
• 8 words or more
• one or more capital letter
• one or more special letter
• Make iOS strong password generation available (later)
• Biometrics (later)

[tatsuyamoriguchi]

Sure! Here's a regular expression sample in Swift to validate email addresses with the @ mark and common domain name formats like .com or .gov:

func isValidEmail(_ email: String) -> Bool {
    let emailRegex = #"^[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}$"#
    let emailPredicate = NSPredicate(format:"SELF MATCHES %@", emailRegex)
    return emailPredicate.evaluate(with: email)
}

// Example usage:
let emailAddress = "example@example.com"
if isValidEmail(emailAddress) {
    print("Valid email address")
} else {
    print("Invalid email address")
}

This regular expression pattern checks for:

1. [A-Z0-9a-z._%+-]+: One or more characters that can be any alphanumeric character, period, underscore, percentage, plus, or hyphen.
2. @: The "@" symbol.
3. [A-Za-z0-9.-]+: One or more characters that can be any alphanumeric character, period, or hyphen (before the domain name).
4. \.: The dot before the top-level domain.
5. [A-Za-z]{2,}: Two or more characters for the top-level domain (like "com", "gov", etc.).

This pattern ensures that the email address follows a typical email format, but note that it might not cover all possible valid email addresses according to the full specifications of the email standard.

[tatsuyamoriguchi]

Certainly! Here's a regular expression sample in Swift to validate passwords adhering to the specified rules:

func isValidPassword(_ password: String) -> Bool {
    let passwordRegex = #"^(?=.*[!@#$%^&*()_+\\-={}[\]|;:'",.<>?])[A-Za-z0-9!@#$%^&*()_+\\-={}[\]|;:'",.<>?]{8,}$"#
    let passwordPredicate = NSPredicate(format:"SELF MATCHES %@", passwordRegex)
    return passwordPredicate.evaluate(with: password)
}

// Example usage:
let password = "Password1!"
if isValidPassword(password) {
    print("Valid password")
} else {
    print("Invalid password")
}

This regular expression pattern checks for:

1. (?=.*[!@#$%^&*()_+\\-={}[\]|;:'",.<>?]): At least one special character from the provided set.
2. [A-Za-z0-9!@#$%^&*()_+\\-={}[\]|;:'",.<>?]{8,}: At least 8 characters long, consisting of alphanumeric characters and the specified special characters.

This pattern ensures that the password meets all four rules:

• Rule 1: 8 characters or more.
• Rule 2: Contains at least one special character.
• Rule 3: Contains at least one capital letter.
• Rule 4: Contains at least one number.

[tatsuyamoriguchi]

Certainly! NSPredicate is a class in Swift (and Objective-C) used to define conditions used to filter or match objects. It's commonly used with collections like arrays or sets, but it can also be used for various other purposes, such as validating strings or performing fetch requests in Core Data.

Here's a brief overview of how NSPredicate works in Swift:

1. Creating NSPredicate: You create an NSPredicate instance by specifying a format string that describes the condition the objects must satisfy. The format string can contain placeholders for dynamic values.

2. Evaluating NSPredicate: Once you have created an NSPredicate, you can evaluate it against objects or values using the evaluate(with:) method. This method returns a boolean value indicating whether the predicate matches the given object or value.

3. Format String Syntax: The format string syntax is similar to a simplified version of SQL WHERE clauses. You can specify conditions like equality, comparison, logical operations (AND, OR, NOT), and patterns matching (using wildcards or regular expressions).

4. Dynamic Values: NSPredicate supports placeholders for dynamic values, which you can provide using the %@ symbol in the format string. You pass the actual values as arguments when evaluating the predicate.

5. Compound Predicates: You can create compound predicates by combining multiple predicates using logical operators like AND, OR, and NOT. Compound predicates allow you to create more complex conditions.

Here's a simple example of using NSPredicate to filter an array of strings:

let array = ["apple", "banana", "orange", "grape"]
let predicate = NSPredicate(format: "SELF CONTAINS[c] %@", "a") // Case-insensitive search for strings containing "a"
let filteredArray = (array as NSArray).filtered(using: predicate)
print(filteredArray) // Output: ["apple", "banana", "grape"]

In this example, we create an NSPredicate that matches strings containing the letter "a" (case-insensitive). We then filter the array using this predicate to get only the elements that match the condition.

Overall, NSPredicate provides a flexible and powerful way to define conditions for filtering or matching objects in Swift.

[tatsuyamoriguchi]

Use Minimum 8 characters at least 1 Uppercase Alphabet, 1 Lowercase Alphabet, 1 Number and 1 Special Character:

        let passwordRegex = #"^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[d$@$!%*?&#])[A-Za-z\\dd$@$!%*?&#]{8,}"#

https://stackoverflow.com/questions/39284607/how-to-implement-a-regex-for-password-validation-in-swift