[aur-dev] [PATCH] Make external links in comments clickable (FS#20137).

[Lukas Fleischer]

On Fri, Oct 01, 2010 at 06:23:06PM +0200, PyroPeter wrote:
> About splitting at boundaries: Contrary to what I have said before,
> using regular expressions seems to be a valid and efficient way.
> (I thought you would have to escape tag-content and attributes in
> different ways (percent-encoding vs. html-entities). After reading
> the HTML4 specification I realized this is not the case, as content and
> attributes are both escaped using html-entities)

Using regular expressions is an efficient way, but they should be
applied before htmlspecialchars() or anything similar is applied. E.g.
we could use preg_match() or preg_match_all() with PREG_OFFSET_CAPTURE
to get the positions of all links, then call a function, that converts
links and converts the stings as necessary, and convert the parts that
don't contain any links separately using htmlspecialchars().