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With inspiration from other libraries

There is a newer version: 2.12.15

package org.mvel2.ast;

import org.mvel2.CompileException;
import org.mvel2.ParserContext;
import org.mvel2.integration.VariableResolverFactory;
import org.mvel2.util.CompilerTools;

import static org.mvel2.util.ParseTools.similarity;

public class Strsim extends ASTNode {
  private ASTNode stmt;
  private ASTNode soundslike;

  public Strsim(ASTNode stmt, ASTNode clsStmt, ParserContext pCtx) {
    super(pCtx);
    this.stmt = stmt;
    this.soundslike = clsStmt;
    CompilerTools.expectType(pCtx, clsStmt, String.class, true);
  }

  public Object getReducedValueAccelerated(Object ctx, Object thisValue, VariableResolverFactory factory) {
    return similarity(String.valueOf(soundslike.getReducedValueAccelerated(ctx, thisValue, factory)),
        ((String) stmt.getReducedValueAccelerated(ctx, thisValue, factory)));
  }

  public Object getReducedValue(Object ctx, Object thisValue, VariableResolverFactory factory) {
    try {
      String i = String.valueOf(soundslike.getReducedValue(ctx, thisValue, factory));
      if (i == null) throw new ClassCastException();

      String x = (String) stmt.getReducedValue(ctx, thisValue, factory);
      if (x == null) throw new CompileException("not a string: " + stmt.getName(), stmt.getExpr(), getStart());

      return similarity(i, x);
    }
    catch (ClassCastException e) {
      throw new CompileException("not a string: " + soundslike.getName(), soundslike.getExpr(), soundslike.getStart());
    }

  }

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