NSUInteger numberofMatch = [regularexpression numberOfMatchesInString:str 
                                                                  options:NSMatchingReportProgress
                                                                    range:NSMakeRange(0, str.length)];
    
    [regularexpression release];
    
    if(numberofMatch > 0)
    {
        NSLog(@"%@ isNumbericString: YES", str);
        return YES;
    }
    
    NSLog(@"%@ isNumbericString: NO", str);
    return NO;
}

//校验用户邮箱
+ (BOOL) validateUserEmail : (NSString *) str
{
    NSRegularExpression *regularexpression = [[NSRegularExpression alloc] 
                                                initWithPattern:@"\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+
([-.]\\w+)*"
                                              options:NSRegularExpressionCaseInsensitive 
                                              error:nil];
    NSUInteger numberofMatch = [regularexpression numberOfMatchesInString:str 
                                                                  options:NSMatchingReportProgress
                                                                    range:NSMakeRange(0, str.length)];
    
    [regularexpression release];
    
    if(numberofMatch > 0)
    {
        NSLog(@"%@ isNumbericString: YES", str);
        return YES;
    }
    
    NSLog(@"%@ isNumbericString: NO", str);
    return NO;
}