[^jpg] is a character class - meaning you match either j, p, org.
Update: and the ^ negates the character class, so [^jpg] matches a single character that is not j, p, or g.
Other than that, I feel your list is incomplete. Why won't you allow .svg images?
And are you aware that it's completely possible to write a script in, say some CGI capable language such as Perl indeed, that would be called my-image-script.(txt|html|bananajuice) that would still generate a valid image in whatever format? But your regexp would disallow it. Is that intentional?
Anyway, this should help you along...
\[img\] # Match opening tag
\s* # Maybe there are spaces inside
.*? # Non-greedy match
\. # A dot
(?: # Non-capturing group
) # End of group
\s* # Maybe there are more spaces still
\[/img\] # Match closing tag
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