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my $test = qq|
sdfiojs pfojsdfs fs [img]sdj fpsdofj spojf sfsf [b] [img]http://www.te
+st.com/image.gif[/img] dfs fs
...
c:\test>junk
http://www.test.com/image.gif
test.gif

while ($test =~ /\[img\]([^\[\]]+?)\[\/img\]/g) {
   print "$1 \n";
}