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s/./($s="$`$'"eq"$`$'"eq reverse"$`$'")&$i++if!$s&&($\=pos)while/ge;$_=$s?$i:./g}{$\||=-1
Try it online!Try it online!
s/./($s="$`$'"eq reverse"$`$'")&$i++if!$s/ge;$_=$s?$i:-1
Try it online!
("$`$'"eq reverse"$`$'")&&($\=pos)while/./g}{$\||=-1
