terakilobyte

db.users.find({'profile.picture': /twimg.*_normal/}).forEach( function(user) {     
    var picture = user.profile.picture.replace(/_normal/, '');     
    user.profile.picture = picture;     
    db.users.save( user );     
    print(user.profile); 
});

db.users.find({email: /@twitter.com/}).forEach( function(user) {     
    var username = user.email.replace('@twitter.com', '');     
    user.profile.username = username;