I see a couple syntactic things. The leading / and the trailing /i should be omitted. roRegEx doesn't need the / delimiters around your expression and the i (for case-insensitive), belongs in the third argument with the m. Also, you don't need to escape the forward slashes within your expression. As for the expression itself, I haven't had nearly enough caffeine yet today to even attempt.
test = CreateObject("roregex","</?\w+((\s+(\w|\w[\w-]*\w)(\s*=\s*(?:\"+chr(34)+".*?\"+chr(34)+"|"+chr(39)+".*?"+chr(39)+"|[^"+chr(39)+"\"+chr(34)+">\s]+))?)+\s*|\s*)/?>","im")
I don't know the context of what you're trying to do, but I wonder if roRegEx.Split() might be more useful. If all you want are the tags from a piece of HTML, splitting on "<" and then working on the smaller chunks might be easier.
The first rule of using a regex to parse HTML is don't do it. The second rule of using a regex to parse HTML is PLEASE don't do it.
Below you'll find your regex in expanded form (it's a wonderful advancement in regexes, all whitespace is ignored and comments can be introduced), and commented. Maybe that will help you spot something.
I generally find it useful to reduce the regex to the bare minimum, send it against some test content, and keep adding back in stuff I think should work bit by bit until it breaks.
/ < # Begin tag \/? # Optional slash denoting a closing element \w+ # Tag name ( # MATCH 1 (\s+ # MATCH 2 \s+ # REQUIRED spaces (\w|\w[\w-]*\w) # MATCH 3 (attribute), Single char or multiple chars with optional hyphen bordered by chars ( # MATCH 4, OPTIONAL \s*=\s* # = with optional bordering spaces (?: # Non-matching group \".*?\" # Non-greedy match of double quoted string | '.*?' # Non-greedy match of single quoted string | [^'\">\s]+ # NOT single or double quote, right angle, or space 1+ times ) )? )+ \s*|\s* ) \/? # Optional ending slash denoting self closing element > /xi
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