Sanitize HTML from String

Removing HTML tags in Java/Spring Boot is straightforward using regular expressions or dedicated libraries. For simple scenarios, a regex suffices:

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

public class HtmlTagRemover {
    public static String removeHtmlTags(String html) {
        Pattern pattern = Pattern.compile("<.*?>"); // Matches any tag
        Matcher matcher = pattern.matcher(html);
        return matcher.replaceAll("");
    }

    public static void main(String[] args) {
        String html = "<p>This is <b>some</b> text.</p>";
        String text = removeHtmlTags(html);
        System.out.println(text); // Output: This is some text.
    }
}

This uses a simple regex "<.*?>". For more robust handling of edge cases (e.g., nested tags, malformed HTML), consider using a dedicated HTML parser like Jsoup:

import org.jsoup.Jsoup;

public class HtmlTagRemoverJsoup {
    public static String removeHtmlTags(String html) {
        return Jsoup.parse(html).text();
    }

    public static void main(String[] args) {
        String html = "<p>This is <b>some</b> text.</p>";
        String text = removeHtmlTags(html);
        System.out.println(text); // Output: This is some text.
    }
}

Remember to add the Jsoup dependency to your pom.xml:

<dependency>
    <groupId>org.jsoup</groupId>
    <artifactId>jsoup</artifactId>
    <version>1.15.4</version> </dependency>

Jsoup offers better handling of complex HTML and avoids potential regex pitfalls. Choose the method best suited to your needs; for simple cases, regex is sufficient; for complex or potentially malicious HTML, Jsoup is recommended. Always sanitize user input before processing to prevent XSS vulnerabilities.