val</span> add_substitute</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -&gt; (string -&gt; string) -&gt; string -&gt; unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_substitute&nbsp;b&nbsp;f&nbsp;s</code> appends the string pattern <code class="code">s</code> at the end
   of buffer <code class="code">b</code> with substitution.
   The substitution process looks for variables into
   the pattern and substitutes each variable name by its value, as
   ob