1.验证邮箱

func isEmail(_ email: String) -> Bool {
    let regex = "[A-Z0-9a-z._% -] @[A-Za-z0-9.-] \\.[A-Za-z]{2,4}"
    let predicate = NSPredicate(format: "SELF MATCHES %@",   regex)
    return predicate.evaluate(with: email)
}

2.验证手机号

func isMobieNumber(_ phoneNumber: String) -> Bool {
// 用枚举改写一下效率会高很多
    let chinaMobie = "^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$"
    let chinaUnicom = "^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$"
    let chinaTelecom = "^1(3[0-2]|5[256]|8[56])\\d{8}$"
    let telephone = "^1((33|53|8[09])[0-9]|349)\\d{7}$"
    
    let isChinaMobie = NSPredicate(format: "SELF MATCH %@", chinaMobie)
    let isChinaUnicom = NSPredicate(format: "SELF MATCH %@", chinaUnicom)
    let isChinaTelecom = NSPredicate(format: "SELF MATCH %@", chinaTelecom)
    let isTelephone = NSPredicate(format: "SELF MATCH %@", telephone)
    
    if isChinaMobie.evaluate(with: phoneNumber) == true || isChinaUnicom.evaluate(with: phoneNumber) == true || isChinaTelecom.evaluate(with: phoneNumber) == true || isTelephone.evaluate(with: phoneNumber) == true  {
        return true
    } else {
        return false
    }
}

3.验证车牌号

func isLicenseNumber(_ number: String) -> Bool {
     let regex = "^[A-Za-z]{1}[A-Za-z_0-9]{5}$"
     let predicate = NSPredicate(format: "SELF MATCHES %@", regex)
     return perdicate.evaluate(with: number)
}

4.验证用户名

func isUserName(_ name: String) -> Bool {
     let regex = "^[A-Za-z0-9]{6,20}+$"
     let predicate = NSPredicate(format: "SELF MATCHES %@", regex)
     return predicate.evaluate(with: name)
   
}

5.验证密码

func isPassword(_ passWord: String) -> Bool {
     let regex = "^[a-zA-Z0-9]{6,20}+$"
     let predicate = NSPredicate(format: "SELF MATCHES%@", regex)
     return predicate.evaluate(with: passWord)
}

6.验证中文

func isChinese(_ chinese: String) -> Bool {  
   let regex = "^[\u{4e00}-\u{9fa5}]{4,8}$"    // 4-8位
   let predicate = NSPredicate(format: "SELF MATCHES%@", regex)  
   return predicate.evaluate(with: chinese)
}