Regex至少验证两个字符类（字母、数字、特殊字符）

Question

((?=.*[a-z])(?=.*[A-Z]))|((?=.*[a-z])(?=.*[\\d]))|((?=.*[A-Z])(?=.*[\\d]))|((?=.*[!#+,.\\=:=@-])(?=.*[\\d]))|((?=.*[!#+,.\\=:=@-])(?=.*[a-z]))|((?=.*[!#+,.\\=:=@-])(?=.*[A-Z]))

wel123 - valid
123@@! - valid
@@@aaa - valid
!!!BDC - valid
ABC123 - valid
rrirrra - invalid
1234567 - invalid
ABCFESS - invalid
@@@!!!! - invalid

Answer 1

您的regex中唯一缺少的是添加开始^和$结束锚点，并正确地对整个regex进行分组。我还从您的regex中删除了不必要的分组，您可以使用此regex,

^(?:(?=.*[a-z])(?=.*[A-Z])|(?=.*[a-z])(?=.*[\d])|(?=.*[A-Z])(?=.*[\d])|(?=.*[!#+,.\\=:=@-])(?=.*[\d])|(?=.*[!#+,.\\=:=@-])(?=.*[a-z])|(?=.*[!#+,.\\=:=@-])(?=.*[A-Z])).+$

Regex演示

尽管这种方法很有效，但我还是建议您编写一段代码来实现这一点，因为这个regex对一般人来说可能是不可维护的。

public static void main(String[] args) {
    int minRequiredMatch = 2;
    List<String> list = Arrays.asList("wel123","123@@!","@@@aaa","!!!BDC","ABC123","rrirrra","1234567","ABCFESS","@@@!!!!");

    list.forEach(x -> {
        System.out.println(x + " - " + (validateTwoCharSets(x, minRequiredMatch)?"Valid":"Invalid"));
    });
}

public static boolean validateTwoCharSets(String str, int minRequiredMatch) {
    List<Pattern> patList = new ArrayList<>();
    patList.add(Pattern.compile("[a-z]"));
    patList.add(Pattern.compile("[A-Z]"));
    patList.add(Pattern.compile("[0-9]"));
    patList.add(Pattern.compile("[!#+,-./:=@]"));

    return validateTwoCharSets(patList, str, minRequiredMatch);
}

public static boolean validateTwoCharSets(List<Pattern> patList, String str, int minRequiredMatch) {
    if (minRequiredMatch <0 || minRequiredMatch > patList.size()) {
        throw new RuntimeException("minRequiredMatch must be a positive number and not more than pattern list size.");
    }
    int matchCount = 0;

    for (Pattern p : patList) {
        Matcher m = p.matcher(str);
        if (m.find()) {
            matchCount++;
        }
        if (matchCount >= minRequiredMatch) {
            return true;
        }
    }

    return false;
}

wel123 - Valid
123@@! - Valid
@@@aaa - Valid
!!!BDC - Valid
ABC123 - Valid
rrirrra - Invalid
1234567 - Invalid
ABCFESS - Invalid
@@@!!!! - Invalid