正则表达式判断输入类型（IOS 开发） 整理

在开发过程中，有时需要对用户输入的类型做判断，最常见是在注册页面即用户名和密码，代码整理如下：

• 只能为中文

-(BOOL)onlyInputChineseCharacters:(NSString*)string{    NSString *zhString = @"[\u4e00-\u9fa5]+";    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",zhString];    BOOL  inputString = [predicate evaluateWithObject:string];    return inputString;}

• 只能为数字

- (BOOL)onlyInputTheNumber:(NSString*)string{    NSString *numString =@"[0-9]*";    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",numString];    BOOL  inputString = [predicate evaluateWithObject:string];    return inputString;}

• 只能为小写

- (BOOL)onlyInputLowercaseLetter:(NSString*)string{    NSString *regex =@"[a-z]*";    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];    BOOL  inputString = [predicate evaluateWithObject:string];    return inputString;}

• *只能为大写

- (BOOL)onlyInputACapital:(NSString*)string{    NSString *regex =@"[A-Z]*";    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];    BOOL  inputString = [predicate evaluateWithObject:string];    return inputString;}

• 允许大小写

- (BOOL)InputCapitalAndLowercaseLetter:(NSString*)string{    NSString *regex =@"[a-zA-Z]*";    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];    BOOL  inputString = [predicate evaluateWithObject:string];    return inputString;}

• 允许含大小写或数字(不限字数)

- (BOOL)inputLettersOrNumbers:(NSString*)string{    NSString *regex =@"[a-zA-Z0-9]*";    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];    BOOL  inputString = [predicate evaluateWithObject:string];    return inputString;}

• 允许含大小写或数字(限字数)

-(BOOL)inputNumberOrLetters:(NSString*)name {    NSString *userNameRegex = @"^[A-Za-z0-9]{6,20}+$";    NSPredicate *userNamePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",userNameRegex];    BOOL  inputString = [userNamePredicate evaluateWithObject:name];    return inputString;}

• 允许汉字或数字(不限字数)

- (BOOL)inputChineseOrNumbers:(NSString*)string{    NSString *regex =@"[\u4e00-\u9fa5]+[0-9]*";    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];    BOOL  inputString = [predicate evaluateWithObject:string];    return inputString;}

• 允许汉字或数字(限字数)

- (BOOL)inputChineseOrNumbersLimit:(NSString*)string{    NSString *regex =@"[\u4e00-\u9fa5][0-9]{6,20}+$";    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];    BOOL  inputString = [predicate evaluateWithObject:string];    return inputString;}

• 允许汉字，大小写或数字(不限字数)

- (BOOL)inputChineseOrLettersAndNumbersNum:(NSString*)string{    NSString *regex =@"[\u4e00-\u9fa5]+[A-Za-z0-9]*";    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];    BOOL  inputString = [predicate evaluateWithObject:string];    return inputString;}

• 允许汉字，大小写或数字(限字数)

- (BOOL)inputChineseOrLettersNumberslimit:(NSString*)string{    NSString *regex =@"[\u4e00-\u9fa5]+[A-Za-z0-9]{6,20}+$";    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];    BOOL  inputString = [predicate evaluateWithObject:string];    return inputString;}