regex - Python Regular Expressions not returning what I am looking for -

i scraping website , content inside specific tag. tag i'd content inside is: <pre class="js-tab-content"></pre>

here code:

request = urllib.request.request(url=url) response = urllib.request.urlopen(request) content = response.read().decode()  tab = re.findall(r'<pre class="js-tab-content">(.*?)</pre>', content)  print(tab) 

when print tab empty list []

here content searching in:

.... <pre class="js-tab-content"><i></i><span>em</span>              <span>d</span>              <span>em</span>             <span>d</span>  lift m ac cahir og face, brooding o'er old disgrace        <span>em</span>                  <span>d</span>                       <span>g</span>-<span>d</span>-<span>em</span>       black fitzwilliam stormed place , drove fern.  <span>em</span>              <span>d</span>           <span>em</span>                         <span>d</span>  gray said victory sure, firebrand he'd secure  <span>em</span>                <span>d</span>          <span>g</span>-<span>d</span>-<span>em</span>  until met @ glenmalure, feach mac hugh o'byrne     chorus:  <span>g</span>                                <span>d</span>  curse , swear, lord kildare, feach feach dare  <span>g</span>                               <span>g</span>-<span>d</span>-<span>em</span>  fitzwilliam have care, fallen star low  <span>g</span>                                       <span>d</span>   halbert, out sword, on go lord  <span>g</span>                               <span>g</span>-<span>d</span>-<span>em</span>  feach mac hugh has given word: follow me carlow     tassagart ____to clonmore flows stream of saxon gore  great rory og o'more @ sending loons hades.  white sick , lane fled, black fitzwilliams head  we'll send over, dripping red, liza , ladies    see swords of glen imayle flashing o'er english pale  see children of gael, beneath o'byrne's banners  rooster of fighting stock, let saxon cock  crow out upon irish rock, fly , teach him manners  </pre> .... 

i not see why returning empty list instead of string inside list content inside.

i have looked around internet around half hour , couldn't find help.

sorry if stupid here, if obvious!

anyway, in advance!

tab = re.findall(r'<pre class="js-tab-content">(.*?)</pre>', content, re.s) 

re.s required . match newline characters.