.. in scalar context is a flipflop operator that does what you describe like this: 
while (<DATA>) {
   # skip everything from line 1 to the #cardtype line
   unless (1../^#cardtype$/) {
      # we're past the junk
   }
}

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It works by returning true once the first condition is met (where the constant 1 here is implicitly compared to the current input line number) and continues to return true until the second condition is met. See perldoc perlop for more information.

In reply to Re: Processing lines after a pattern in a while loop by ysth
in thread Processing lines after a pattern in a while loop by NovMonk

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