"notes">
<dt>Parameters:</dt>
<dd><code>name</code> - the message header.</dd>
<dd><code>valueSeparatorRegex</code> - Regular expression that separates the header value into single values. <code>null</code> does not split.</dd>
<dd><code>valuePredicate</code> - value must fulfil this predicate.</dd>
<dt>Returns:</dt>
<dd><code>true</code> if and only if a header with the given name exists, having either a whitespace-trimmed value
 matching the predicate, or having at least one whitespace-trimmed single valu