productive evening

bunderru

// Copy and paste into console, hit enter
var walker = document.createTreeWalker(
    document.body, 
    NodeFilter.SHOW_TEXT, 
    null, 
    false
);

var node;

while(node = walker.nextNode()) {
    node.nodeValue = node.nodeValue.replace(/ll[aeiou]?/g,'rru').replace(/ls\b/g,'rres').replace(/dle/g, 'derru').replace(/([aeiou])l+[aeiou]?/g,'$1r').replace(/([AEIOU]?)L+([AEIOU])?/g,'$1R$2').replace(/([aeiou]?)l+([aeiou])?/g,'$1r$2').replace(/([BPDKT])l/g, '$1r').replace(/ss+/g, 'sh');
}
'';