ldopen" id="foldopen00030" data-start="" data-end="">
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"><a class="line" href="group__group__string.html#ga8138bcb734cadd41bccf9966556cdf4e">   30</a></span>    <span class="keywordtype">pure</span> <span class="keyword">function </span><a class="code hl_function" href="group__group__string.html#ga8138bcb734cadd41bccf9966556cdf4e">is_letter</a>(ch) <span class="keyword">result</span>(res)</div>
<div class="line"><a id="l00031" name="l00031