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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * 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.
 */

package org.mvel2.ast;

import org.mvel2.ParserContext;
import org.mvel2.integration.VariableResolverFactory;

import static java.lang.String.valueOf;
import static java.util.regex.Pattern.compile;
import static org.mvel2.MVEL.eval;

public class RegExMatchNode extends ASTNode {
  private ASTNode node;
  private ASTNode patternNode;

  public RegExMatchNode(ASTNode matchNode, ASTNode patternNode, ParserContext pCtx) {
    super(pCtx);
    this.node = matchNode;
    this.patternNode = patternNode;
  }

  public Object getReducedValueAccelerated(Object ctx, Object thisValue, VariableResolverFactory factory) {
    return compile(valueOf(patternNode.getReducedValueAccelerated(ctx, thisValue, factory))).matcher(valueOf(node.getReducedValueAccelerated(ctx, thisValue, factory))).matches();
  }

  public Object getReducedValue(Object ctx, Object thisValue, VariableResolverFactory factory) {
    return compile(valueOf(eval(expr, patternNode.start, patternNode.offset, ctx, factory)))
        .matcher(valueOf(eval(expr, node.start, node.offset, ctx, factory))).matches();
  }

  public Class getEgressType() {
    return Boolean.class;
  }
}