I had a input line of 100k characters '0' or '1'. I tried to solve a problem and find length of alternating subsequence. My approach was 
() = $line =~ /(.)\1*/g

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When I got test-case '0' x 100k, I gain answer of 4, not 1. Because (I think) it found three matches of length 32678 and the rest shorter match.
When I used 
() = $line =~ /(.)\1*\1*\1*\1*/g

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- it worked slower on test case '01' x 50k. But I can't say how slower, because it was only a part of program (maybe not hot point).

In reply to Re^4: How to match more than 32766 times in regex? by rsFalse
in thread How to match more than 32766 times in regex? by rsFalse

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