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Just for the record, here's a fairly straightforward one treating the score as a string.  It replaces '/' with the appropriate count and dupes the following char (unless it's an extra ball), replacing X with x to avoid processing the X twice.  Then it dupes the 2 chars following each X (again, except for extras), and tallies.  It passes all of the above tests and comes in at 96 chars:
sub score { $_=pop; # 7 s#(.)/(?=(.).|.?$)#$1.($1?10-$1:'x').lc$2#ge; # 45 s/X(?=(..).)/X$1/g; # 19 y/Xx/9/+eval join'+',/./g # 25 } # ___ # 96
Only one problem, it fails for a strike in the 9th frame and no extra balls in the 10th!  /X\d\d$/ matches either. (Also, there's no agreement on whether the args passed in have to match the orginal @b example.) Patching for those makes it 123 :-( :
sub fullscore { $_=join'',@_; # 13 s/^(X|\d.){10}$/$&0/; # 21 s#(.)/(?=(.).|.?$)#$1.($1?10-$1:'x').lc$2#ge; # 45 s/X(?=(..).)/X$1/g; # 19 y/Xx/9/+eval join'+',/./g # 25 } # ___ # 123


In reply to Re: (Golf) Let's go bowling by petral
in thread (Golf) Let's go bowling by virtualsue

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    [stonecolddevin]: Discipulus i don't practice anymore but i studied Pai Lum, it was a mish mash of northern and southern. lots of emphasis on the 5 animals

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