You could split on whitespace if none the values are expected to contain whitespace.

But let's say you want to pass -x 123 -y 'some val'.

One approach you could take is 

prog [options] -X '-x 123' -X '-y some val' [options] [args]

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Split on the first instance of whitespace only. 

# my @extra_args = ( '-x', '123', '-y', 'some val' );
my @extra_args = map { split( /\s+/, $_, 2 ) } @opt_X;

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In reply to Re: Parsing a command-line string into an array by ikegami
in thread Parsing a command-line string into an array by bliako

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