I have a link by exexplo:
<a href="#sessao">Sessão</a>
And another link:
<a href="https://...">Link Externo</a>
I would like to know how, I believe by regular expression, a way to test if my link contains "#", so I can give a preventDefault whatsoever!
You do not need regex, just use indexOf .
For example:
var href = elemento.getAttribute('href');
if (href.indexOf('#') != 0) e.preventDefault();
The String.indexOf(char) gives you the position of the given character in a string. If it is there the position should be 0 , if it is not it is a "normal link".
Just to answer your question with regex, which I advise against in this case, might look like this:
var href = elemento.getAttribute('href');
if (!href.match(/^#/)) e.preventDefault();