iOS开发笔记-判断输入的是否是字母

+(BOOL)isABC:(NSString *)str{

    NSRegularExpression *tLetterRegularExpression = [NSRegularExpression
regularExpressionWithPattern:@"[A-Za-z]"
options:NSRegularExpressionCaseInsensitive
error:nil];

    

    int tLetterMatchCount = [tLetterRegularExpression numberOfMatchesInString:str options:NSMatchingReportProgress range:NSMakeRange(0, str.length)];

    

    if(tLetterMatchCount>=1){

        return YES;

    }else{

        return NO;

    }

}