提取网站中两个字符串之间的子字符串

(?<=string1).*?(?=string2)

import re

def extract_substring(string, string1, string2):
    pattern = f"(?<={string1}).*?(?={string2})"
    match = re.search(pattern, string)
    if match:
        return match.group(0)
    else:
        return None

# 示例用法
website_content = "This is a sample website. The substring between 'sample' and 'substring' will be extracted."
substring = extract_substring(website_content, "sample", "substring")
print(substring)

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

public class SubstringExtractor {
    public static String extractSubstring(String string, String string1, String string2) {
        String pattern = "(?<=" + string1 + ").*?(?=" + string2 + ")";
        Pattern regex = Pattern.compile(pattern);
        Matcher matcher = regex.matcher(string);
        if (matcher.find()) {
            return matcher.group();
        } else {
            return null;
        }
    }

    // 示例用法
    public static void main(String[] args) {
        String websiteContent = "This is a sample website. The substring between 'sample' and 'substring' will be extracted.";
        String substring = extractSubstring(websiteContent, "sample", "substring");
        System.out.println(substring);
    }
}