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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
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 * Project Info:  https://plantuml.com
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 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License V2.
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 * LICENSE ("AGREEMENT"). [GNU General Public License V2]
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 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
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 * You may obtain a copy of the License at
 *
 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
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 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
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 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this GPL v2 license.
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 * The generated images can then be used without any reference to the GPL v2 license.
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 * although this will be appreciated by the PlantUML team.
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 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
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 * Icons provided by OpenIconic :  https://useiconic.com/open
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 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
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 *
 */
package net.sourceforge.plantuml.regex;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.regex.Pattern;

class MaxSizeHashMap extends LinkedHashMap {
	private final int maxSize;

	public MaxSizeHashMap(int maxSize) {
		this.maxSize = maxSize;
	}

	@Override
	protected boolean removeEldestEntry(Map.Entry eldest) {
		return size() > maxSize;
	}
}

// Splitter.java to be finished
public abstract class MyPattern {

	private static final Map cache = new MaxSizeHashMap<>(512);

	private static final Pattern2 EMPTY = new Pattern2(Pattern.compile(""));

//	static int CPT1;
//	static int CPT2;

	public static Pattern2 cmpile(final String p) {
		if (p == null || p.length() == 0) {
			return EMPTY;
		}
//		CPT1++;
		Pattern2 result = null;
		synchronized (cache) {
			result = cache.get(p);
			if (result != null) {
				return result;
			}
		}
		assert result == null;
		result = new Pattern2(Pattern.compile(transform(p), Pattern.CASE_INSENSITIVE));

		synchronized (cache) {
			cache.put(p, result);
//			CPT2++;
//			System.err.println("CPT= " + CPT1 + " / " + CPT2 + " " + cache.size());
		}

		return result;
	}

	private static String transform(String p) {
		// Replace ReadLineReader.java
		// p = p.replace("%pLN", "\\p{L}0-9"); // Unicode Letter, digit
		p = p.replace("%pLN", "\\p{L}\\p{N}"); // Unicode Letter, digit
		p = p.replace("%s", "\\s\u00A0"); // space
		p = p.replace("%q", "'\u2018\u2019"); // quote
		p = p.replace("%g", "\"\u201c\u201d"); // double quote
		return p;
	}

	public static boolean mtches(CharSequence input, String regex) {
		return cmpile(regex).matcher(input).matches();
	}

	public static CharSequence removeAll(CharSequence src, String regex) {
		return src.toString().replaceAll(transform(regex), "");
	}

}