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c:\@Work\Perl\monks>perl -wMstrict -le
"my $s = '    a     ';
...
 print $-[0];
"
4

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c:\@Work\Perl\monks>perl -wMstrict -le
"my $s = 'xyzzyBARxkcdFOOyz';
...
offset of first vowel: 6
offset of last vowel: 14
offset of first vowel: none