my $newstring = munge_string( 'one_two_three', '312' );
print $newstring;
sub munge_string {
$_ = $_[1]; split /[^a-zA-Z]+/, $_[0];
s/(\d)/$_[$1-1]/g; return $_;
}
I'm assuming you don't want to modify the original strings. I'm also assuming that your words are divided on non-letter boundaries.
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