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Re: (golf) Collapse repetitions within a string

by kilinrax (Deacon)
on Jun 25, 2003 at 13:57 UTC ( #268859=note: print w/replies, xml ) Need Help??

in reply to (golf) Collapse repetitions within a string

This comes in at 107 chars (not counting command line invocation):
perl -Mstrict -wlne 'while(s/(\w+?)\1+//){print$`if$`;my@L=split"(?=$1 +)",$&;printf"%s repeated %i time%s\n",$1,$#L+1,$#L?"s":""}'
Or, more readably:
while(s/(\w+?)(\1+)//) { print $` if $`; my @L = split "(?=$1)", $&; printf "%s repeated %i time%s\n", $1, $#L+1, $#L ? 's' : '' }
Note that this version is slightly more accurate to the spec you've given; by your own definitions 'foofooofooo' should give:
foo repeated 2 time(s)
o repeated 3 time(s)
i.e. not separate stuff that fits no sequence into individual characters (like '123456').

Update: as Corion points out, without the ternary op to add the optional 's', or the 'my', you can take this down to a mere 93 characters:
perl -wlne 'while(s/(\w+?)\1+//){print$`if$`;@L=split"(?=$1)",$&;print +f"%s repeated %i times\n",$1,$#L+1}'

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