Use a character class:

$f =~ s/\s(i|a|e|o|u|y|E):(\s|$)/ $1 /;

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I also changed the \1 to a $1, since $1 will catch the matched value in parens.

Update: Of course iakobski and Hofmator are right, so don't look here, look further down.
I changed the errornous code.

In reply to Re: finding nonword character at end of strings by busunsl
in thread finding nonword character at end of strings by Micz

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