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[url|desc|target]

<a href="url" target="target">desc</a>

[www.test.com|test page]

...
[www.test.com|test page|new]

would make <a href="www.test.com" target="new">test page</a>

s/\[(.+\/\/.+?)\|(.+?)\]/<a href="$1" target="new">$2<\/a>/gi;