ator_builder</a></span></code></dt><dd><p>Validate if a string is not empty</p><pre><code class="ml">let validator input =
  let open Validator in
  build build_valid
  |&gt; validate input.name (string_is_not_empty &quot;Must not be blank&quot;)</code></pre></dd></dl><dl><dt class="spec value" id="val-string_is_int"><a href="#val-string_is_int" class="anchor"></a><code><span class="keyword">val</span> string_is_int : <span><span>(string, int, <span class="type-var">'err</span>)</span> <a href="index.html