Phone number validation using libPhoneNumber Library

libPhoneNumber

libphoneNumber Library is used to validate the phone number and it is a google's library mostly used by google products and Whatsapp

phone number validation is important for app so that you can get valid number from your users. Any verification code, messages that you want to send them will have less chances of being missed.

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How to check if the email is valid in iOS sdk

Many apps require email validation in iOS. Here the function that can be used to check if email string is valid or not. It can be achieved by NSPredicate like following:

-(BOOL)isValidEmail:(NSString *)checkString
{
    long numberOfAtPieces = [[checkString  componentsSeparatedByString:@"@"] count];

    if (numberOfAtPieces > 2){
        return NO;
    }

    BOOL stricterFilter = NO;
    NSString *stricterFilterString = @"[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}";
    NSString *laxString = @".+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2}[A-Za-z]*";
    NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    return [emailTest evaluateWithObject:checkString];
}

Just past the checkString as email you want to validate and it returns 'YES' if email is valid else returns 'NO'.

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Form Validations in HTML5

Different type of validation for HTML5:

    1. Required Attribute: It is used when the value before submission of a form in not filled.
    It is sometimes known as Mandatory or Compulsory field.

    Use of "required" attribute.
    Example:

        <form action="" method="post">
        Name:<br>
        <input type="text" name="name" required>
        <br>
        Age:<br>
        <input type="text" name="age" required><br>
        Email:<br><input type="email" name="email" required placeholder="Enter a valid email address"><br>
        Website:<br><input type="url" name="website" required pattern="https?://.+"><br>
        <input type="submit" />
        </form><br>

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