Added license to Regex Tester

Author: haukex

web/regex_demo.html

@@ -4,6 +4,27 @@
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 <title>WebPerl Regex Tester</title>
 
+<!-- ----- WebPerl - http://webperl.zero-g.net -----
+
+Copyright (c) 2018 Hauke Daempfling (haukex@zero-g.net)
+at the Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB),
+Berlin, Germany, http://www.igb-berlin.de
+
+This program is free software; you can redistribute it and/or modify
+it under the same terms as Perl 5 itself: either the GNU General Public
+License as published by the Free Software Foundation (either version 1,
+or, at your option, any later version), or the "Artistic License" which
+comes with Perl 5.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+See the licenses for details.
+
+You should have received a copy of the licenses along with this program.
+If not, see http://perldoc.perl.org/index-licence.html
+-->
+
 <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/8.0.0/normalize.min.css"
 	integrity="sha256-oSrCnRYXvHG31SBifqP2PM1uje7SJUyX0nTwO2RJV54=" crossorigin="anonymous" />
 <style>
@@ -442,5 +463,10 @@
 
 <pre id="perlinfo" style="margin-top:0.5em"></pre>
 
+<div style="margin-top:1em;font-size:0.8em">
+Author, Copyright, and License: see
+<a href="https://github.com/haukex/webperl/blob/master/web/regex_demo.html" target="_blank">the source code of this file</a>.<br/>
+</div>
+
 </body>
 </html>