[英]Regular expression for complex password
I need to validate passwords that needs to fulfill the following rules: 我需要验证需要满足以下规则的密码:
I can't figure out how to validate this using regular expressions. 我无法弄清楚如何使用正则表达式验证这一点。 Can anybody help me? 有谁能够帮助我?
^(?=.*[A-Z])(?=.*(?:\d|-))(?!.*(.).*\1)[a-zA-Z]{2}.{4,}[a-zA-Z]{2}$
Try this.See demo. 试试这个。看看演示。
https://regex101.com/r/eZ0yP4/12 https://regex101.com/r/eZ0yP4/12
As you can see step by step all conditions are met with the help of lookahead. 正如您可以逐步看到的所有条件都在前瞻的帮助下得到满足。
(?=.*[AZ])
===at least one Capital (?=.*[AZ])
===至少有一个资本
(?=.*(?:\\d|-))
===at least one digit or -
(?=.*(?:\\d|-))
===至少一位数或-
(?!.*(.).*\\1)
=== no duplicates (?!.*(.).*\\1)
===没有重复
[a-zA-Z]{2}.{4,}[a-zA-Z]{2}
===alphabetic characters as first two and last two. [a-zA-Z]{2}.{4,}[a-zA-Z]{2}
===字母字符作为前两个和后两个字符。
You could use vt password library . 你可以使用vt密码库 。 Code is quite long, but it is easy to modify it and it is quite maintainable. 代码很长,但很容易修改它,并且它非常易于维护。
// password must be between 8 and 16 chars long
LengthRule lengthRule = new LengthRule(8, 16);
// don't allow whitespace
WhitespaceRule whitespaceRule = new WhitespaceRule();
// control allowed characters
CharacterCharacteristicsRule charRule = new CharacterCharacteristicsRule();
// require at least 1 digit in passwords
charRule.getRules().add(new DigitCharacterRule(1));
// require at least 1 non-alphanumeric char
charRule.getRules().add(new NonAlphanumericCharacterRule(1));
// require at least 1 upper case char
charRule.getRules().add(new UppercaseCharacterRule(1));
// require at least 1 lower case char
charRule.getRules().add(new LowercaseCharacterRule(1));
// require at least 3 of the previous rules be met
charRule.setNumberOfCharacteristics(3);
// don't allow alphabetical sequences
AlphabeticalSequenceRule alphaSeqRule = new AlphabeticalSequenceRule();
// don't allow numerical sequences of length 3
NumericalSequenceRule numSeqRule = new NumericalSequenceRule(3);
// don't allow qwerty sequences
QwertySequenceRule qwertySeqRule = new QwertySequenceRule();
// don't allow 4 repeat characters
RepeatCharacterRegexRule repeatRule = new RepeatCharacterRegexRule(4);
// group all rules together in a List
List<Rule> ruleList = new ArrayList<Rule>();
ruleList.add(lengthRule);
ruleList.add(whitespaceRule);
ruleList.add(charRule);
ruleList.add(alphaSeqRule);
ruleList.add(numSeqRule);
ruleList.add(qwertySeqRule);
ruleList.add(repeatRule);
PasswordValidator validator = new PasswordValidator(ruleList);
PasswordData passwordData = new PasswordData(new Password("testpassword"));
RuleResult result = validator.validate(passwordData);
if (result.isValid()) {
System.out.println("Valid password");
} else {
System.out.println("Invalid password:");
for (String msg : validator.getMessages(result)) {
System.out.println(msg);
}
}
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