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This can be done without advanced features like lookaheads ...

It seems strange to me to see a regex lookahead (or, in general, a look-around) assertion described as 'advanced'. It's as if one had said "X can be done without advanced features like lexical variables or hard references." Present, I believe (although I haven't taken the trouble to confirm this), since version 5.0, this is a feature I consider part of the 'baseline' definition of Perl 5.

Whenever I allude to a feature like the  \K regex operator or the defined-or operator, I feel obliged to mention that is is only available beginning with Perl version 5.whatever and I make an effort to highlight its presence in a code example by including a  use 5.x; statement at the beginning, but I always assume that Perl 5 is the baseline for discussion nowadays. (Does anyone use a version 4 interpreter anymore?)

This is only idle curiosity, but can you say why you consider regex look-around assertions advanced?

In reply to Re^2: regex to rename last _ with , by AnomalousMonk
in thread regex to rename last _ with , by Anonymous Monk

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