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TBEL is a powerful expression language for ThingsBoard platform user-defined functions. Original implementation is based on MVEL.

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/**
 * 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.CompileException;
import org.mvel2.ParserContext;
import org.mvel2.compiler.ExecutableLiteral;
import org.mvel2.compiler.ExecutableStatement;
import org.mvel2.integration.VariableResolverFactory;

import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

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

public class RegExMatch extends ASTNode {
  private ExecutableStatement stmt;
  private ExecutableStatement patternStmt;

  private int patternStart;
  private int patternOffset;
  private Pattern p;

  public RegExMatch(char[] expr, int start, int offset, int fields, int patternStart, int patternOffset, ParserContext pCtx) {
    super(pCtx);
    this.expr = expr;
    this.start = start;
    this.offset = offset;
    this.patternStart = patternStart;
    this.patternOffset = patternOffset;

    if ((fields & COMPILE_IMMEDIATE) != 0) {
      this.stmt = (ExecutableStatement) subCompileExpression(expr, start, offset, pCtx);
      if ((this.patternStmt = (ExecutableStatement)
          subCompileExpression(expr, patternStart, patternOffset, pCtx)) instanceof ExecutableLiteral) {

        try {
          p = compile(valueOf(patternStmt.getValue(null, null)));
        }
        catch (PatternSyntaxException e) {
          throw new CompileException("bad regular expression", expr, patternStart, e);
        }
      }
    }
  }


  public Object getReducedValueAccelerated(Object ctx, Object thisValue, VariableResolverFactory factory) {
    if (p == null) {
      return compile(valueOf(patternStmt.getValue(ctx, thisValue, factory))).matcher(valueOf(stmt.getValue(ctx, thisValue, factory))).matches();
    }
    else {
      return p.matcher(valueOf(stmt.getValue(ctx, thisValue, factory))).matches();
    }
  }

  public Object getReducedValue(Object ctx, Object thisValue, VariableResolverFactory factory) {
    try {
      return compile(valueOf(eval(expr, patternStart, patternOffset, ctx, factory))).matcher(valueOf(eval(expr, start, offset, ctx, factory))).matches();
    }
    catch (PatternSyntaxException e) {
      throw new CompileException("bad regular expression", expr, patternStart, e);
    }
  }

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

  public Pattern getPattern() {
    return p;
  }

  public ExecutableStatement getStatement() {
    return stmt;
  }

  public ExecutableStatement getPatternStatement() {
    return patternStmt;
  }
}