java - 如何在字符串中搜索关键字，然后在 java 中打印该关键字之后的任何内容？

Question

我想在字符串中搜索特定单词，然后在该单词之后打印接下来的 5 个字符。我不知道该怎么做。我曾尝试搜索教程，但找不到任何东西。

Answer 1

您可以对字符串使用 indexOf 方法，然后对后面的字符进行子字符串处理。

int start = yourString.indexOf(searchString);
System.out.println(yourString.subString(start + 1, start + 6);

Answer 2

Matcher您可以使用和使用正则表达式轻松完成此操作Pattern

import java.util.regex.*; //import

    public class stringAfterString { //class declaration
        public static void main(String [] args) { //main method
            Pattern pattern = Pattern.compile("(?<=sentence).*"); //regular expression, matches anything after sentence

            Matcher matcher = pattern.matcher("Some lame sentence that is awesome!"); //match it to this sentence

            boolean found = false;
            while (matcher.find()) { //if it is found
                System.out.println("I found the text: " + matcher.group().toString()); //print it
                found = true;
            }
            if (!found) { //if not
                System.out.println("I didn't find the text."); //say it wasn't found
            }
        }
    }

此代码在单词 sentence 之后查找并打印任何内容。代码中的注释解释了它是如何工作的。