如何使用Java基于预定义规则整理文本？附示例

下面针对两个常见的文本整理场景，给出具体的Java实现代码：

场景1：移除指定关键词之后的所有内容 #

需求：移除文本中"To help support the channel"及之后的所有内容（注：若只需移除关键词后的内容、保留关键词本身，可调整代码截取逻辑）

原始文本 #

About organic gardening, bees & beekeeping, blacksmithing, plant breeding, composting, natural farming, natural handicrafts, terra preta, biochar, compost tea, garden experiments, growing fungi & seed saving. To help support the channel: BTC Donation Address 14Tp6keFTi7YGXZdj1EfajwcZGTVQkkFfm

实现代码 #

public class TextCleaner {
    public static String cutAfterKeyword(String input, String keyword) {
        int keywordPos = input.indexOf(keyword);
        if (keywordPos != -1) {
            // 截取到关键词的起始位置，移除关键词及之后的内容
            return input.substring(0, keywordPos).trim();
            // 若需保留关键词，改为：return input.substring(0, keywordPos + keyword.length()).trim();
        }
        // 未找到关键词时返回原文本
        return input;
    }

    public static void main(String[] args) {
        String rawText = "About organic gardening, bees & beekeeping, blacksmithing, plant breeding, composting, natural farming, natural handicrafts, terra preta, biochar, compost tea, garden experiments, growing fungi & seed saving. To help support the channel: BTC Donation Address 14Tp6keFTi7YGXZdj1EfajwcZGTVQkkFfm";
        String cleanedText = cutAfterKeyword(rawText, "To help support the channel");
        System.out.println(cleanedText);
    }
}

处理后效果 #

About organic gardening, bees & beekeeping, blacksmithing, plant breeding, composting, natural farming, natural handicrafts, terra preta, biochar, compost tea, garden experiments, growing fungi & seed saving.

场景2：保留About板块，移除Official Website及下方内容 #

需求：保留文本中About板块（包括后续的Links标题），移除"Official Website"及之后的所有内容

原始文本 #

About

Look no further if sports is your forte, head no further if you want to watch your favorite sport!
Links

Official Website
whatsapp.com/channel/0029Va6mIWNIyPtZGmLTup1w

Twitter Link
twitter.com/StarSportsIndia

Facebook Link
facebook.com/starsportsindia

Instagram Link
instagram.com/starsportsindia

实现代码 #

用正则表达式匹配并截取目标内容，适合处理多行文本：

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class SectionFilter {
    public static String keepAboutAndLinks(String input) {
        // (?s) 开启单行模式，让.匹配换行符；(?=\\nOfficial Website) 正向预查，匹配到Official Website前的内容
        Pattern pattern = Pattern.compile("(?s)^.*?(?=\\nOfficial Website)");
        Matcher matcher = pattern.matcher(input);
        if (matcher.find()) {
            return matcher.group().trim();
        }
        return input;
    }

    public static void main(String[] args) {
        String rawText = "About\n\nLook no further if sports is your forte, head no further if you want to watch your favorite sport!\nLinks\n\nOfficial Website\nwhatsapp.com/channel/0029Va6mIWNIyPtZGmLTup1w\n\nTwitter Link\ntwitter.com/StarSportsIndia\n\nFacebook Link\nfacebook.com/starsportsindia\n\nInstagram Link\ninstagram.com/starsportsindia";
        String filteredText = keepAboutAndLinks(rawText);
        System.out.println(filteredText);
    }
}

处理后效果 #

About

Look no further if sports is your forte, head no further if you want to watch your favorite sport!
Links

内容的提问来源于stack exchange，提问作者user352290