text - Visual Basic String variable alternative -

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I have a problem at present that string variables in visible origin are too small for my needs, just like 2 million characters Can capture but my script is sorting a list of IPs. Each list contains 10 - 100 million IPs, I get an error because the variable is too small, is there any option for string? (It can not be as long as alphanumeric) The error I get is found here:


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