"spec value" id="val-string_is_email"><a href="#val-string_is_email" class="anchor"></a><code><span class="keyword">val</span> string_is_email : <span><span>(string, string, <span class="type-var">'err</span>)</span> <a href="index.html#type-validator_builder">validator_builder</a></span></code></dt><dd><p>Validate if a string is an email. This checks if a string follows a simple pattern `_@_`.</p><pre><code class="ml">let validator input =
  let open Validator in
  build build_valid
  |&gt; validate inpu