'<' should be save, while '?' will sooner or later cause conflicts with $url.</p>
<p>The non-standard option letter <tt class="LITERAL">T</tt> (trivial) prevents parsing for backreferences in the
substitute. Use it if you want to include text like '$&' in your substitute without quoting.</p>
- <p>If you are new to <a href="http://en.wikipedia.org/wiki/Regular_expressions" target="_top"><span class=
+ <p>If you are new to <a href="https://en.wikipedia.org/wiki/Regular_expressions" target="_top"><span class=
"QUOTE">"Regular Expressions"</span></a>, you might want to take a look at the <a href=
"appendix.html#REGEX">Appendix on regular expressions</a>, and see the <a href=
"http://perldoc.perl.org/perlre.html" target="_top">Perl manual</a> for <a href=