I have this:
str = \"some html code [img]......[/img] some html code [img]......[/img]\"
and I want to get this:
[\"[img]..
irb(main):001:0> str = "some html code [img]......[/img] some html \
code [img]......[/img]"
"some html code [img]......[/img] some html code [img]......[/img]"
irb(main):002:0> str.scan(/\[img\].*?\[\/img\]/)
["[img]......[/img]", "[img]......[/img]"]
Keep in mind that this is a very specific answer that is based on your exact question. Change str by, say, adding an image tag within an image tag, and all Hell will break loose.