html5 - Restricting characters in bootstrap input field using pattern attribute -

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i have following field in bootstrap framework php page.

<div class="col-xs-12 col-sm-10">     <div class="form-group">   <input type="text" name="inp_field1" id="inp_field1" class="form-control input-sm" placeholder="do here..." value='<?php echo($data_text_1)?>' required                                  data-toggle="tooltip" title="do here..." tabindex="3">     </div> </div>

i need restrict few characters example /@. how can restrict specific characters. not looking can allowed cannot instead. ideally if can done using pattern attribute, great.

try 

<div class="col-xs-12 col-sm-10">     <div class="form-group">      <input type="text" name="inp_field1" id="inp_field1"               class="form-control input-sm"               placeholder="do here..." value='<?php echo($data_text_1)?>'               required data-toggle="tooltip" title="do here..."                 tabindex="3"              pattern="[^@\\]"> </div>


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