How make a link redirect in text of a textarea

I have a textarea and i need identify the netlinks and website to redirect.
<div class="form-group"> @Html.LabelFor(model => model.Descricao) @Html.TextAreaFor(model => model.Descricao, new { @class = "form-control", @id = "txtNome", @onkeyup = "javascript:limita(this, 400)" }) <div id="cont"></div> @Html.ValidationMessageFor(model => model.Descricao) </div>