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255 characters, minus four for newlines. I could cut it down at least to 243 if it doesn't need -w and strict.

It's not beautiful, but it's much nicer than my first attempt:

sub assemble{my($f,$s)=splice(@_,0,2);return$f unless$s; $f=(sort{length($a)<=>length($b)}(c($f,$s),c($s,$f)))[0]; assemble($f,@_)} sub c{($_,$b)=@_;return$_ if/$b/;my $r='';while($b and$r=chop($b).$r and!(index($_,$b)>0)){}$_.$r.(length($b)==1?$b:'')}

Update: I see what the problem is. Luckily, a fix is even shorter. Here's one at 246 characters, minus four newlines. Removing -w and strict would put me around 230:

sub assemble{my($f,$s)=splice(@_,0,2);return$f unless$s; $f=(sort{length($a)<=>length($b)}(c($f,$s),c($s,$f)))[0]; assemble($f,@_)} sub c{($_,$b)=@_;return$_ if/$b/;my $r='';while($b and$r=chop($b).$r and!(index($_,$b)>0)){}$_.$r.(/$b$/?'':$b)}

In reply to Re: (Golf) Fragment Reassembly by chromatic
in thread (Golf) Fragment Reassembly by MeowChow

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