text: // Copyright JS Foundation and other contributors, http://js.foundation
  //
  // 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.
  
  var r;
  
  r = new RegExp ();
  assert (r.source == "(?:)");
  assert (r.global == false);
  assert (r.ignoreCase == false);
  assert (r.multiline == false);
  
  r = new RegExp ("a");
  assert (r.source == "a");
  assert (r.global == false);
  assert (r.ignoreCase == false);
  assert (r.multiline == false);
  
  r = new RegExp ("a","gim");
  assert (r.source == "a");
  assert (r.global == true);
  assert (r.ignoreCase == true);
  assert (r.multiline == true);
  
  r = RegExp ("a");
  assert (r.source == "a");
  assert (r.global == false);
  assert (r.ignoreCase == false);
  assert (r.multiline == false);
  
  r = RegExp ("a","gim");
  assert (r.source == "a");
  assert (r.global == true);
  assert (r.ignoreCase == true);
  assert (r.multiline == true);
  
  var r2;
  
  r2 = RegExp (r);
  assert (r2.source == "a");
  assert (r2.global == true);
  assert (r2.ignoreCase == true);
  assert (r2.multiline == true);
  
  r2 = RegExp (r, undefined);
  assert (r2.source == "a");
  assert (r2.global == true);
  assert (r2.ignoreCase == true);
  assert (r2.multiline == true);
  
  r = /(?:)/;
  assert (r.source == "(?:)");
  assert (r.global == false);
  assert (r.ignoreCase == false);
  assert (r.multiline == false);
  
  r = /a/;
  assert (r.source == "a");
  assert (r.global == false);
  assert (r.ignoreCase == false);
  assert (r.multiline == false);
  
  r = /a/gim;
  assert (r.source == "a");
  assert (r.global == true);
  assert (r.ignoreCase == true);
  assert (r.multiline == true);
  
  /* The 'undefined' argument for the RegExp constructor should not be converted to string,
   * and it should behave just like when there is no argument.
   */
  r1 = new RegExp();
  r2 = new RegExp(undefined);
  var foo;
  r3 = new RegExp(foo)
  
  assert (r1.source === r2.source);
  assert (r2.source === r3.source);
  
  r = new RegExp ("foo", undefined);
  assert (r.source === "foo");
  assert (r.global === false);
  assert (r.ignoreCase === false);
  assert (r.multiline === false);
  
  r = new RegExp ("foo", void 0);
  assert (r.source === "foo");
  assert (r.global === false);
  assert (r.ignoreCase === false);
  assert (r.multiline === false);
  
  try {
    new RegExp (undefined, "ii");
    assert (false);
  } catch (e) {
    assert (e instanceof SyntaxError);
  }
  
  try {
    new RegExp ("", "gg");
    assert (false);
  } catch (e) {
    assert (e instanceof SyntaxError);
  }
  
  try {
    new RegExp (void 0, "mm");
    assert (false);
  } catch (e) {
    assert (e instanceof SyntaxError);
  }
  
  r = new RegExp (undefined, undefined);
  assert (r.source == "(?:)");
  assert (r.global == false);
  assert (r.ignoreCase == false);
  assert (r.multiline == false);
  
  /* RegExp properties */
  assert (RegExp.length === 2);
  