moodle/message/search.html

<form id="personsearch" method="post">
<div><input type="hidden" name="tab" value="search" /></div>

<div id="combinedcontactssearchspan" class="mdl-left">
<table cellpadding="5" class="message_form">
    <tr>
        <td colspan="3" class="message_heading mdl-left">
            <input type="text" name="combinedsearch" size="50" id="combinedsearch" value="<?php echo $combinedsearchstring; ?>" />
            <input type="submit" name="combinedsubmit" value="<?php print_string('searchcombined','message') ?>" />
            <a href="contacts.php?advanced=1" id="advancedcontactsearchlink"><?php print_string('advanced') ?></a>
        </td>
    </tr>
</table>
</div>

</form>