WordPress/wp-admin/js/password-strength-meter.dev.js

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// Password strength meter
function passwordStrength(password,username) {
var shortPass = 1, badPass = 2, goodPass = 3, strongPass = 4, symbolSize = 0, natLog, score;
//password < 4
if (password.length < 4 ) { return shortPass };
//password == username
if (password.toLowerCase()==username.toLowerCase()) return badPass;
if (password.match(/[0-9]/)) symbolSize +=10;
if (password.match(/[a-z]/)) symbolSize +=26;
if (password.match(/[A-Z]/)) symbolSize +=26;
if (password.match(/[^a-zA-Z0-9]/)) symbolSize +=31;
natLog = Math.log( Math.pow(symbolSize,password.length) );
score = natLog / Math.LN2;
if (score < 40 ) return badPass
if (score < 56 ) return goodPass
return strongPass;
}