Objective-c中的正则表达式无法正常工作

@implementation NSString (regexMatch)

- (BOOL)matchesRegex:(NSString *)regexPattern
{
    NSError *error = nil;

    NSRegularExpression* regex = [NSRegularExpression
                                  regularExpressionWithPattern:regexPattern 
                                  options:NSRegularExpressionSearch
                                  error:&error];

    if(error) 
    {
        NSLog(@"Error on maches regex: %@ on %@: %@",regex,self,error);
        return NO;
    }

    NSUInteger maches = [regex numberOfMatchesinstring:self 
                                               options:NSRegularExpressionSearch 
                                                 range:NsmakeRange(0,[self length])];

    return (maches > 0);
}

@end

正则表达式：

const static NSString *REGEX_VALID_PASS = @"(^((?=.*\\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[-_,.@#$%'\"]).{6,20})$)";

单元测试：

//password 
// at least:
//  - between 6 and 20 chars
//  - a capital character
//  - a small character
//  - a digit
//  - a special char: - _,. @ # $% ´ '
STAssertTrue([@"Pass1-" matchesRegex:rEGEX_VALID_PASS],@"password 1 @L_801_1@");

STAssertTrue([@"aPrettyLongPassw0rd@" matchesRegex:rEGEX_VALID_PASS],@"password 2 @L_801_1@");

STAssertTrue([@"Pw987321-_,.@#$%'`" matchesRegex:rEGEX_VALID_PASS],@"password 3 @L_801_1@");

//Returns TRUE ???
STAssertfalse([@"password1@" matchesRegex:rEGEX_VALID_PASS],@"Wrong password 4 works (No capital letter)");

//Returns TRUE ???
STAssertfalse([@"passworD2#" matchesRegex:rEGEX_VALID_PASS],@"Wrong password 5 works (No small letter)");

STAssertfalse([@"password8" matchesRegex:rEGEX_VALID_PASS],@"Wrong password 6 works (No special letter)");

STAssertfalse([@"password$" matchesRegex:rEGEX_VALID_PASS],@"Wrong password 7 works (No digit letter)");

STAssertfalse([@"PrettyLongpasswordIsWrong123#" matchesRegex:rEGEX_VALID_PASS],@"Wrong password 8 works (> 20)");

STAssertfalse([@"Pw@3" matchesRegex:rEGEX_VALID_PASS],@"Wrong password 9 works (< 6)");

密码’password1 @’和’passworD2#’返回TRUE但不正确.

错误：

file://localhost/Users/user/app/AppTest.m: error: testRegex (AppTest) @L_801_1@: "[@"password1@" matchesRegex:rEGEX_VALID_PASS]" should be false. Wrong password 4 works (No capital letter)

and


file://localhost/Users/user/app/AppTest.m: error: testRegex (AppTest) @L_801_1@: "[@"passworD2#" matchesRegex:rEGEX_VALID_PASS]" should be false. Wrong password 5 works (No small letter)