The following expression resets the position at which the next match will start: 

$post_message =~ s/\Q[[$1]]/[[$article_id]]/sig;

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You'd be better off reading from one var and storing the output in another. 

while ($input =~ /\G(.*?)\[\[([^]]+)\]\]/sg) {
   my $link = $2;
   $output .= $1;
   $output .= process($link);
}

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Update: Oops, there's a bug in the above. It drops whatever's after the last link. It's actually easier to solve using a different technique. 

$post_message =~ s{\[\[([^]]+)\]\]}{
   process($1)
}esg;

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In reply to Re: Regex keeps looping on itself :/ by ikegami
in thread Regex keeps looping on itself :/ by ultranerds

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