input : <p class="normal">nfection <span class="small">[<a id="ch1-bid.1" href="#rch1-bid.1">1</a>]</span>.</p>
<p class="normal">nfection <span class="small">[<a id="ch1-bid.2" href="#rch1-bid.2">2</a>]</span>.</p>
<p class="normal">nfection <span class="small">[<a id="ch1-bid.4" href="#rch1-bid.4">4</a>]</span>.</p>
<p class="normal">nfection <span class="small">[<a id="ch1-bid.4" href="#rch1-bid.4">4</a>]</span>.</p>

-----------------------------------


output : <p class="normal">nfection <span class="small">[<a id="ch1-bid.1" href="#rch1-bid.1">1</a>]</span>.</p>
<p class="normal">nfection <span class="small">[<a id="ch1-bid.2" href="#rch1-bid.2">2</a>]</span>.</p>
<p class="normal">nfection <span class="small">[<a id="ch1-bid.4" href="#rch1-bid.4">4</a>]</span>.</p>
<p class="normal">nfection <span class="small">[<a href="#rch1-bid.4">4</a>]</span>.</p>
======end
don't want  id="ch1-bid.4" tab. pls find