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DC3/gist:5478249

Created April 28, 2013 20:14
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gistfile1.js
'wkjkjd fsk fsdjk\nbbb sss fasdf'.replace(/(bbb|sss)(\s)?/g, function(match, p1, p2){
var min = 1, max = p1.length - 1,
pos = Math.floor(Math.random() * (max - min + 1)) + min; //randint
return p1.substr(0, pos) + 'a' + p1.substr(pos, p1.length - 1) + p2;
});
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