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my $test = qq|
sdfiojs pfojsdfs fs [img]sdj fpsdofj spojf sfsf [b] [img]http://www.te
+st.com/image.gif[/img] dfs fs
s fsf sfd  [img]test.gif[/img]
...
while ($test =~ /\[img\](.+?)\[\/img\]/g) {
   print "$1 \n";
}

C:\Users\Andy>perl test.pl
sdj fpsdofj spojf sfsf [b] [img]http://www.test.com/image.gi
test.gif

C:\Users\Andy>perl test.pl
http://www.test.com/image.gif
test.gif