onionr/static-data/www/shared/sites.js

function checkHex(str) {
    regexp = /^[0-9a-fA-F]+$/
    if (regexp.test(str)){
        return true
    }
    return false
}

document.getElementById('openSite').onclick = function(){
    var hash = document.getElementById('siteViewer').value
    if (hash.length == 0){ return }
    if (checkHex(hash) && hash.length >= 50 || hash.length == 52 || hash.length == 56){
        window.location.href = '/site/' + hash
    }
    else{
        PNotify.notice({
            text: 'Invalid site hash/ID'
        })
    }
}