I need to match newlines and whitespaces between
IMG BBCodes in series so I can replace them with single whitespace. But the problem is they also could be wrapped with
URL tags (so this means the
URL tag is optional). Here are some possible combinations:
[/img] [img ...] [/img][/url] [url ...][img ...] [/img] [url ...][img ...] [/img][/url] [img ...]
Sadly, it also matches BBCodes which I don't want to. Please check it on regex101 (I want green ones -
Group 1 only).
I can't use positive lookbehind because it says "A quantifier inside a lookbehind makes it non-fixed" when I try to make
URL tag optional. See my attempt here.