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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

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package org.mozilla.javascript.regexp;

import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;

public class NativeRegExpInstantiator {

    private NativeRegExpInstantiator() {}

    static NativeRegExp withLanguageVersion(int languageVersion) {
        if (languageVersion < Context.VERSION_ES6) {
            return new NativeRegExpCallable();
        } else {
            return new NativeRegExp();
        }
    }

    static NativeRegExp withLanguageVersionScopeCompiled(
            int languageVersion, Scriptable scope, RECompiled compiled) {
        if (languageVersion < Context.VERSION_ES6) {
            return new NativeRegExpCallable(scope, compiled);
        } else {
            return new NativeRegExp(scope, compiled);
        }
    }
}