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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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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

js> x = RegExp('')
/(?:)/
js> x.source

js> RegExp('a').source
a
js> RegExp('\\\\').source
\\
js> RegExp('\\\\\\\\').source
\\\\
js> x = RegExp('/')
/\//
js> x.source
\/
js> x.test('/')
true
js> x = RegExp('//')
/\/\//
js> x.source
\/\/
js> x.test('//')
true
js> x = RegExp('\/')
/\//
js> x.source
\/
js> x.test('/')
true
js> x = RegExp('\\/')
/\//
js> x.source
\/
js> x.test('/')
true
js> x = RegExp('\\\/')
/\//
js> x.source
\/
js> x.test('/')
true
js> x = RegExp('\\\\/')
/\\//
js> x.source
\\/
js> x.test('/')
false
js> x.test('\\/')
true
js> x = RegExp('/abc\/foo\\/bar\\\/xyz/')
/\/abc\/foo\/bar\/xyz\//
js> x.source
\/abc\/foo\/bar\/xyz\/
js> x.test('/abc/foo/bar/xyz/')
true
js> RegExp('[^/]*')
/[^\/]*/
js> RegExp('[^\/]*')
/[^\/]*/
js> RegExp('[^\\/]*')
/[^\/]*/

js> /./.compile('')
/(?:)/
js> /./.compile('a')
/a/
js> /./.compile('\\\\')
/\\/
js> /./.compile('\\\\\\\\')
/\\\\/
js> /./.compile('/')
/\//
js> /./.compile('//')
/\/\//
js> /./.compile('\/')
/\//
js> /./.compile('\\/')
/\//
js> /./.compile('\\\/')
/\//
js> /./.compile('\\\\/')
/\\//
js> /./.compile('/abc\/foo\\/bar\\\/xyz/')
/\/abc\/foo\/bar\/xyz\//
js> /./.compile('[^/]*')
/[^\/]*/
js> /./.compile('[^\/]*')
/[^\/]*/
js> /./.compile('[^\\/]*')
/[^\/]*/