if u wish u can try this

regexp

$input="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";

$input =~ s#(.{64})#\1\n#gs;

print $input;

[download]

output:

***************

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

Regards,

Senthil Kumar.k

In reply to Re: line break after 64 characters by perlsen
in thread line break after 64 characters by piyush.shourie

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