The stuff after trailing slashes in regexps
 

It took quite a bit of research, but here's what those characters after regular expressions mean:

• i: case-insensitive
• c: effectively means return what doesn't match the expression
• m: don't ignore whitespace differences
• s: ignore multiple lines when using the match chars (*, ?, +, etc.)
• x: allow whitespace and comments (for readability)
• U: don't be greedy

I still can't figure out what U does (vB uses //siU everywhere), but those five are the common ones.

What does the i do in siU?

Case-insensitive (stupid JS-based vB code generator...)

U specifies "greediness". Roughly that is whether search returns the largest matched pair or the smallest, if there are more than 1 matches.

But isn't .? used for that (rather than .*)?

Say you have this text:
and you are trying to match chars between [bbb] tags. Would your regular expression return:
or:
that is what greediness parameter specifies.

I know what it means, I mean that isn't that what the ? operator is used for rather than the * operator?