Just one of your code lines to comment: 
print @filehandles[$i] if (/@regex[$i]/../^END_OF_BLOCK/);

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First, at the very least, to refer to elements of an array, this should be: 
print $filehandles[$i] if (/$regex[$i]/../^END_OF_BLOCK/);

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Second, I do not really see the point of the ../^END_OF_BLOCK/ part in your context.

Finally, I cannot test right now, but I don't think that: 

print $filehandles[$i] $_;

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is going to work properly. I think you probably need something like this: 
print {$filehandles[$i]} $_;

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Otherwise, some of the errors that you have would be picked up by the compiler if you had used the following pragmas: 
use strict;
use warnings;

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at or near the top of your script file.

In reply to Re: Write to multiple files according to multiple regex by Laurent_R
in thread Write to multiple files according to multiple regex by Foodeywo

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