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Allow a Scratch 2.x project to be embedded in BBcode
// Usage: [scratch]projectID[/scratch]
var posts = document.getElementsByClassName("postmsg");
var pattern = /\[scratch\]([0-9]+)\[\/scratch\]/gi;
for (var i = 0; i < posts.length; i++) {
var post = posts[i];
post.innerHTML = post.innerHTML.replace(pattern, "<iframe allowtransparency=\"true\" width=\"485\" height=\"402\" src=\"$1/\" frameborder=\"0\" allowfullscreen></iframe>");
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