for ( 0 .. $#array ) { 
    my $element = shift @array;   
    push @array, $elt eq 'condition' ? my_sub( $elt ) : $elt;
}

[download]

Update: As suggested by Skeeve in his reply below, I've written an explanation in my reply to him.

-sauoq
"My two cents aren't worth a dime.";

In reply to Re: Inserting into an array while stepping through it by sauoq
in thread Inserting into an array while stepping through it by Anonymous Monk

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