Edit in JSFiddle

a[href='#$$']*3>img[src='' alt='filename$$$@5']*3

<a href="#01">
   <img src="" alt="filename001@5">
   <img src="" alt="filename002@5">
   <img src="" alt="filename003@5">
</a>
<a href="#02">
   <img src="" alt="filename001@5">
   <img src="" alt="filename002@5">
   <img src="" alt="filename003@5">
</a>
<a href="#03">
   <img src="" alt="filename001@5">
   <img src="" alt="filename002@5">
   <img src="" alt="filename003@5">
</a>