NetUtils.java

package me.xiaopan.sketchsample.net;

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

public class NetUtils {

    public static String substring(String sourceContent, String prefix, String suffix, String subPrefix) {
        String categoryRecommendRegex = prefix + "[\\d\\D\\s\\S]*?" + suffix;
        Matcher matcher = Pattern.compile(categoryRecommendRegex).matcher(sourceContent);
        if (!matcher.find()) {
            return null;
        }
        String fullJsonContent = matcher.group();
        // 截掉prefix和suffix
        if (fullJsonContent.length() < prefix.length() + suffix.length()) {
            return null;
        }
        fullJsonContent = fullJsonContent.substring(prefix.length(), fullJsonContent.length() - suffix.length()).trim();
        if (subPrefix != null && fullJsonContent.length() > subPrefix.length()) {
            fullJsonContent = fullJsonContent.substring(subPrefix.length(), fullJsonContent.length());
        }
        return fullJsonContent;
    }
}