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Re: Replace the nth occurence

by LanX (Bishop)
on Nov 21, 2012 at 23:16 UTC ( #1005026=note: print w/replies, xml ) Need Help??

in reply to Replace the nth occurence

++AnomalousMonk for demonstrating what \K is good for! =)

Maybe I'm boring ... but I prefer more explicit code with split-and-join over regex-acrobatics:

my $nth = 4; my $str = 'a,bb,ccc,dddd,eeeee,ffffff'; my @str= split /,/,$str; $str = join ( "," , @str[0..$nth-1] ) . "|" . join ( "," , @str[$nth.. +$#str] ); print qq{'$str'};

Cheers Rolf

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Re^2: Replace the nth occurence
by AnomalousMonk (Chancellor) on Nov 23, 2012 at 06:22 UTC
    ... I prefer more explicit code ... over regex-acrobatics ...

    And, in general, so do I. However, I spent so much effort figuring out regexes and they offer so many bright doodads and shiny gewgaws that my first reaction to a question like the OP is "Hey, I should be able to do this (or do it better) with a regex like..." So I put together a regex and it works – sort of; and I see how I can fix it by putting in a positive look-ahead here; and that makes it better, but still not quite, but if I put in an alternation there...; oops, now it doesn't work at all; oh, I see, that should have been...; that's a lot better, but there's still this corner case... And so it goes. But in the end I learn a little more about regexes, which makes me a little more likely to turn to them in the future... This stuff isn't syntactic sugar, it's syntactic heroin!

      > This stuff isn't syntactic sugar, it's syntactic heroin!

      LOL ... true so true.

      I really miss the time when I needed to optimize stuff in 68000-assembler.

      So for me hacking regexes is a methadone program! ;-)

      Cheers Rolf

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