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    my $string_exp = 'something in this string is a number. ${=NumberForma
    +t "99999999"} is a number. And another ${=CharFormat "X*"} is ${=Numb
    +erFormat "9+"}.';
    # remove the left curly bracket from the last NumberFormat placeholder
    + in the above string
    ...
    }
    
    print "END\n";