Swift正则表达式--判断输入类型

//只能为中文
func onlyInputChineseCharacters(_ string: String) -> Bool {
    var inputString = "[\u{4e00}-\u{9fa5}]+"
    var predicate = NSPredicate(format: "SELF MATCHES %@", inputString)
    var Chinese = predicate.evaluate(withObject: string)
    return Chinese

}

//只能为数字
func onlyInputTheNumber(_ string: String) -> Bool {
    var numString = "[0-9]*"
    var predicate = NSPredicate(format: "SELF MATCHES %@", numString)
    var number = predicate.evaluate(withObject: string)
    return number
}

//只能为小写

func onlyInputLowercaseLetter(_ string: String) -> Bool {
    var regex = "[a-z]*"
    var predicate = NSPredicate(format: "SELF MATCHES %@", regex)
    var letter = predicate.evaluate(withObject: string)
    return letter
}

//只能为大写

func onlyInputACapital(_ string: String) -> Bool {
    var regex = "[A-Z]*"
    var predicate = NSPredicate(format: "SELF MATCHES %@", regex)
    var capital = predicate.evaluate(withObject: string)
    return capital

}

//允许大小写
func inputCapitalAndLowercaseLetter(_ string: String) -> Bool {
    var regex = "[a-zA-Z]*"
    var predicate = NSPredicate(format: "SELF MATCHES %@", regex)
    var inputString = predicate.evaluate(withObject: string)
    return inputString
}

//允许大小写或数字(不限字数)

func inputLettersOrNumbers(_ string: String) -> Bool {
    var regex = "[a-zA-Z0-9]*"
    var predicate = NSPredicate(format: "SELF MATCHES %@", regex)
    var inputString = predicate.evaluate(withObject: string)
    return inputString

}

//允许大小写或数字(限字数)
func inputNumberOrLetters(_ name: String) -> Bool {
    var userNameRegex = "^[A-Za-z0-9]{6,20}+$"
    var userNamePredicate = NSPredicate(format: "SELF MATCHES %@", userNameRegex)
    var inputString = userNamePredicate.evaluate(withObject: name)
    return inputString
}

//允许汉字，大小写或数字(限字数)
func inputChineseOrLettersNumberslimit(_ string: String) -> Bool {
    var regex = "[\u{4e00}-\u{9fa5}]+[A-Za-z0-9]{6,20}+$"
    var predicate = NSPredicate(format: "SELF MATCHES %@", regex)
    var inputString = predicate.evaluate(withObject: string)
    return inputString
}

//允许汉字或数字(不限字数)
func inputChineseOrNumbers(_ string: String) -> Bool {
    var regex = "[\u{4e00}-\u{9fa5}]+[0-9]*"
    var predicate = NSPredicate(format: "SELF MATCHES %@", regex)
    var inputString = predicate.evaluate(withObject: string)
    return inputString
}

//允许汉字或数字(限字数)
func inputChineseOrNumbersLimit(_ string: String) -> Bool {
    var regex = "[\u{4e00}-\u{9fa5}][0-9]{6,20}+$"
    var predicate = NSPredicate(format: "SELF MATCHES %@", regex)
    var inputString = predicate.evaluate(withObject: string)
    return inputString
}

//允许汉字，大小写或数字(不限字数)

func inputChineseOrLettersAndNumbersNum(_ string: String) -> Bool {
    var regex = "[\u{4e00}-\u{9fa5}]+[A-Za-z0-9]*"
    var predicate = NSPredicate(format: "SELF MATCHES %@", regex)
    var inputString = predicate.evaluate(withObject: string)
    return inputString

}

//允许汉字，大小写或数字(限字数)
func inputChineseOrLettersNumberslimit(_ string: String) -> Bool {
    var regex = "[\u{4e00}-\u{9fa5}]+[A-Za-z0-9]{6,20}+$"
    var predicate = NSPredicate(format: "SELF MATCHES %@", regex)
    var inputString = predicate.evaluate(withObject: string)
    return inputString
}