ios - 确认密码的正则表达式

Question

我的密码正则表达式是

- (NSString *) getRegularExpression:(NSString *)extraWords
{
    /*
     *  ^$          Empty string
     *  |           Or
     *  ^           Start of a string
     *  []          Explicit set of characters to match
     *  ^[:space:]  Matches any non-white-space character - equivalent to \S
     *  {6,30}      6-20 characters
     *  $           End of a string
     */
    return @"^$|^[^[:space:]]{6,20}$";
}

如何编写包含上述要求并且也等于我的密码字符串的确认密码正则表达式。有人可以帮助我吗？

Answer 1

在你的shouldChangeCharactersInRange中你可以这样做

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{

    NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];

    NSString *expression = @"^$|^[^[:space:]]{6,20}$";

    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:expression 
                                                                           options:NSRegularExpressionCaseInsensitive 
                                                                            error:nil];
    NSUInteger numberOfMatches = [regex numberOfMatchesInString:newString
                                                        options:0
                                                          range:NSMakeRange(0, [newString length])];        
    if (numberOfMatches == 0)
        return NO;        


    return YES;
}