Wouldn't anchoring the pattern at the end of the string with  \z or one of its ilk (e.g.,  m{ pat \z }xms) tend to be faster since the  .* doesn't need to 'consume' virtually the whole file? Or is this the kind of thing that just gets optimized away?

Update: Contrary to krish28's clarification in Re^2: Matching Regular expression at EOF, this question assumes the entire file is held in a single string. But the question still stands.

In reply to Re^2: Matching Regular expression at EOF by AnomalousMonk
in thread Matching Regular expression at EOF by krish28

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