title: Is it possible in bootstrap or HTML to only accept string as input in forms?
body: <p>I want the input to username as string only. Is it possible or should I use Formik?</p>
  
  <pre><code>&lt;form&gt;
    &lt;div class="form-group"&gt;
      &lt;label for="exampleInputText"&gt;UserName&lt;/label&gt;
      &lt;input type="text" class="form-control" id="exampleInputTextl1" aria-describedby="textHelp" placeholder="Enter Username"&gt;
      &lt;/div&gt;
      &lt;div class="form-group"&gt;
        &lt;label for="exampleInputPassword1"&gt;Password&lt;/label&gt;
        &lt;input type="password" class="form-control" id="exampleInputPassword1" placeholder="Password"&gt;
        &lt;/div&gt;
        &lt;div class="form-group form-check"&gt;
          &lt;input type="checkbox" class="form-check-input" id="exampleCheck1"&gt;
            &lt;label class="form-check-label" for="exampleCheck1"&gt;Check me out&lt;/label&gt;
          &lt;/div&gt;
          &lt;button type="submit" class="btn btn-primary"&gt;Submit&lt;/button&gt;
        &lt;/form&gt;
  </code></pre>