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[resolvido] Como Validar A Expressao "http://" Em Javascript



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olha ai! ve se e isso que você quer?

function verifica(url){
    var inicio = url.substr(0,7);
    if(inicio != "http://")
        alert("erro preencah o campo com http");
<input type="text" id="url" />
<input type="button" onclick="verifica(document.getElementById('url').value);" value="verifica" />

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