如何检查整数重复序列

如何检查整数重复序列

您可以寻求正则表达式的帮助来解决此问题。考虑这样的代码：

String arr[] = {"12341234abc", "1234foo1234", "12121212", "111111111", "1a1212b123123c12341234d1234512345"};String regex = "(\d+?)";Pattern p = Pattern.compile(regex);for (String elem : arr) {    boolean noMatchFound = true;    Matcher matcher = p.matcher(elem);    while (matcher.find()) {        noMatchFound = false;        System.out.println(elem + " got repeated: " + matcher.group(1));    }    if (noMatchFound) {        System.out.println(elem + " has no repeation");    }}

输出：

abc12341234abc got repeated: 12341234foo1234 has no repeation12121212 got repeated: 1212121212 got repeated: 12111111111 got repeated: 1111111111 got repeated: 1111111111 got repeated: 1111111111 got repeated: 11a1212b123123c12341234d1234512345 got repeated: 121a1212b123123c12341234d1234512345 got repeated: 1231a1212b123123c12341234d1234512345 got repeated: 12341a1212b123123c12341234d1234512345 got repeated: 12345

说明：

使用正则表达式的

(\d+?)

地方

\d        - means a numerical digit\d+       - means 1 or more occurrences of a digit\d+?      - means reluctant (non-greedy) match of 1 OR more digits( and )    - to group the above regex into group # 1        - means back reference to group # 1(\d+?) - repeat the group # 1 immediately after group # 1