ype"><code class="computeroutput"><span class="identifier">match_flag_type</span></code></a> flags.
                    For each match found calls the call-back function cb as: <code class="computeroutput"><span class="identifier">cb</span><span class="special">(*</span><span class="keyword">this</span><span class="special">);</span></code>
                    If at any stage the call-back function returns false then the
                    grep operation terminates, otherwise continues until no further
   