To answer the general question, you use /^(?s:(?!ending-regex).)*/ but for any particular case, there will be a more efficient way.

Update: I didn't mean to apply the //s flag to the ending-regex; should have been /^(?:(?!ending-regex)(?s:.))*/.

In your case, to do something like that you would need to switch to slurping in the whole file instead of reading line by line (by undef'ing $/). You may prefer to keep the code you have and just interrogate the return value of your ..: 

while (<>) {
   my $inrange = /^\.subckt/../^\w/;
   if ( $inrange && $inrange !~ /E/ ) {
      print;
   }
}

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The scalar .. operator returns a positive count if you are in the range. At the end of the range the count has "E0" appended to it, explicitly so you can check for this condition.

In reply to Re: regexp match up to but not incliuding... by ysth
in thread regexp match up to but not incliuding... by substrate

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