Regex : Phone number starting with 06 or 07

Question

I have this function which works only for 10 digits.

function telValide( tel )
{
    var reg = new RegExp(\'^[0-9]{10}$\', \'i\');
    return reg.test(tel);
}
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Answer 1

var reg = new RegExp('^((06)|(07))[0-9]{8}$', 'i');