https://jsoup.org/: jsoup is a Java library for working with real-world HTML. It provides a very convenient API for extracting and manipulating data, using the best of DOM, CSS, and jquery-like methods. jsoup implements the WHATWG HTML5 specification, and parses HTML to the same DOM as modern browsers do. (Jonathan Hedley)
  • Jonathan Hedley 
package org.jsoup.internal;

import java.util.Locale;


Util methods for normalizing strings. Jsoup internal use only, please don't depend on this API.

/**
 * Util methods for normalizing strings. Jsoup internal use only, please don't depend on this API.
 */
public final class Normalizer {

    public static String lowerCase(final String input) {
        return input != null ? input.toLowerCase(Locale.ENGLISH) : "";
    }

    public static String normalize(final String input) {
        return lowerCase(input).trim();
    }
}