No recursion needed.

You could regex your input to form a glob pattern: 

 main::(-e:1):   0
  DB<1> x <Prefix1={A,B}:{c,d}>
0  'Prefix1=A:c'
1  'Prefix1=A:d'
2  'Prefix1=B:c'
3  'Prefix1=B:d'
  DB<2> @keys = <Prefix1={A,B}:{c,d}>

  DB<3> @hash{@keys} = ('value1') x @keys

[download]

> (which I'd rather not bore you with)

That's a bad approach because first it wasn't clear for me what you are trying to achieve.

Especially because %hash = {...} is broken Perl. :)

HTH!

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

Update

A demo to build the glob pattern:

  DB<22> ($pre,@comb) = split /=|:/, "Prefix1=A,B:c,d"

  DB<23> p $pattern = "$pre=" . join ":", map { "{$_}" } @comb
Prefix1={A,B}:{c,d}
  DB<24> x <"$pattern">
0  'Prefix1=A:c'
1  'Prefix1=A:d'
2  'Prefix1=B:c'
3  'Prefix1=B:d'
  DB<25>

[download]

NB: You should take care to properly escape potential meta characters like * or ?

In reply to Re: Combinations of lists, etc by LanX
in thread Combinations of lists to a hash by tel2

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