It's also ambiguous if all matches fail:
c:\@Work\Perl\monks>perl -wMstrict -le
"for (qw(a X b)) {
/(a)/ or /(b)/;
my $id = $1;
print qq{'$_' -> '$id'};
}
"
'a' -> 'a'
'X' -> 'a'
'b' -> 'b'
Update 1: Something like
my $id = $1 // $2 if m!/key/(\d+)|/(\d+)-\d+!;
(if you avoid the problem of the conditionally declared lexical!) does not suffer this:
c:\@Work\Perl\monks>perl -wMstrict -le
"for (qw(a X b)) {
/(a)|(b)/ or next;
my $id = $1 // $2;
print qq{'$_' -> '$id'};
}
"
'a' -> 'a'
'b' -> 'b'
Update 2: Slight wording change to first sentence.
Give a man a fish: <%-{-{-{-<
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