U может использовать это
email: {
required: true, email: true
},
c_email: {
required: true, equalTo: "#email", minlength: 5
},
<div class="form-row"><span class="label">email</span><input type="email" name="email" class="required" id="email" /></div>
<div class="form-row"><span class="label">Confirm email</span><input type="email" name="c_email" id="c_email" /></div>