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Bootstrap class: .radio

<div class="input-group">
  <div class="input-group-prepend">
    <div class="input-group-text">
    <input type="radio" aria-label="Radio button for following text input">
    </div>
  </div>
  <input type="text" class="form-control" aria-label="Text input with radio button">
</div>

Preview