sed/regex question.. missing something simple...

[bruce]

Hi.

I've got a file.. with a bunch of lines looking like:

  $bookVariable['asu']['Fall-2016']='link';
  $bookVariable['lehmancuny']['Fall-2016']='1';
  $bookVariable['uvu']['Fall-2016']='1';
  $bookVariable['wmich']['Summer II 2017']='1';
  $bookVariable['wmich']['Summer I 2017']='1';
  $bookVariable['dmacc']['Summer-2017']='1';
  $bookVariable['sdmesa']['Summer-2017']='link';

I''m looking to get the "text" inside the 1st group of brackets []


The following sed only gets the 1st 3 lines.. and it doesn't completely work.

sed -n "s/^.*bookVariable\['\(\S*\)'].*$/\1/p"  foo.txt

asu']['Fall-2016
lehmancuny']['Fall-2016
uvu']['Fall-2016


thanks..
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