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Changes between Version 2 and Version 3 of Ticket #48261, comment 4

v2	v3
4	4
5	5	This patch adds the extra condition {{{preg_match( '#(?:^\s\|\s+)rel\s=#', $link_html )}}} if the attributes-regex are matched. Here {{{(?:)}}} is a non-capturing group and we check if rel is the first attribute (that can be without white space from left in {{{$link_html}}}) or the second (or later) attribute (that need a white space from left in {{{$link_html}}}). I first tried to modify the existing attributes-regex with this approach but it ended up with more changes, so I currently prefer this approach.
	6
	7	ps: we could simplify to {{{preg_match( '#(^\s\|\s+)rel\s=#', $link_html )}}} as the first version was when I tested it within the attributes-regex, with existing capturing groups.