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Re^3: Efficient way to replace a set of values with another set of values

by space_monk (Chaplain)
on Nov 23, 2012 at 13:08 UTC ( #1005263=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Efficient way to replace a set of values with another set of values
in thread Efficient way to replace a set of values with another set of values

Parent beat me to the one line solution, but perhaps a minor mod may be needed; I suspect that the OP may have numbers larger than just 1-6, so perhaps:

perl -pi -e 's/^(\d+)/chr($1+96)/e' myfile
A Monk aims to give answers to those who have none, and to learn from those who know more.


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Re^4: Efficient way to replace a set of values with another set of values
by roboticus (Canon) on Nov 23, 2012 at 14:57 UTC

    space_monk:

    OK, your solution is a bit better .... at least until you get to "27. This is a really long list!".

    ;^D

    ...roboticus

    When your only tool is a hammer, all problems look like your thumb.

      Ha ha. I spent an inordinate amount of time trying to make a one-liner solution for arbitrarily large numbers (where it would go to "aa" after "z"). However, it turned out that today is Friday and I can't think that hard.



      When's the last time you used duct tape on a duct? --Larry Wall

        You were looking for:

        s/^(\d+)/$n=$1;$l="a";$l++while--$n;$l/meg

        Doesn't cope with 0 especially well.

        perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
      ... until you get to "27. This is a really long list!".

      Maybe something like (and 'zz' could easily be 'zzz'):

      >perl -wMstrict -e "my @lines = ( '1. This is just a sample.', '2. This is to check', '3. How a set of values', '4. can be replaced by another', '5. set of values and that too', '6. in the most efficient way.', '99. And also handle large numbers.', '999. Oops, too big!', '99 bottles of beer on the wall does not translate!', ); ;; my %xlate; { my @alphas = (undef, 'a' .. 'zz'); @xlate{ 1 .. $#alphas } = @alphas[ 1 .. $#alphas ]; } ;; s{ \A (\d+) (?= [.]) } { exists $xlate{$1} ? $xlate{$1} : (warn(qq{bad '$1' in '$_'}), '??') }xmse for @lines; ;; print qq{$_\n} for @lines; " bad '999' in '999. Oops, too big!' at -e line 1. a. This is just a sample. b. This is to check c. How a set of values d. can be replaced by another e. set of values and that too f. in the most efficient way. cu. And also handle large numbers. ??. Oops, too big! 99 bottles of beer on the wall does not translate!

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