在Java字符串中找到子字符串的第n次出现? [英] find the nth occurence of a substring in a string in java?

问题描述

我有一个字符串，它是html页面的完整内容，我正在尝试查找</table> 的第二次出现的索引.有人对如何实现这一目标有什么建议吗?

I have a string that is the complete content of an html page and I am trying to find the index of 2nd occurence of </table>. Does anyone have any suggestions on how to achieve this?

推荐答案

在这里很有趣；)

public static int findNthIndexOf (String str, String needle, int occurence)
            throws IndexOutOfBoundsException {
    int index = -1;
    Pattern p = Pattern.compile(needle, Pattern.MULTILINE);
    Matcher m = p.matcher(str);
    while(m.find()) {
        if (--occurence == 0) {
            index = m.start();
            break;
        }
    }
    if (index < 0) throw new IndexOutOfBoundsException();
    return index;
}

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