BuddyPress.org

Alternative solution: Use the following Javascript to generate a username on typing:

function copyinputuser()

{

var tmp = document.getElementById('field_1').value;

tmp = tmp.toLowerCase().replace(/^\s+|\s+$/g, "").replace(/[_|\s]+/g, "");

tmp = tmp.replace(/[^a-z0-9-]+/g, "").replace(/[-]+/g, "").replace(/^-+|-+$/g, "");

document.getElementById('user_name').value = tmp;

}

And then add onkeyup=”copyinputuser()” to the field_1 input tag, which requires an ugly hack in a core file.