This works fine for me:
use strict;
use warnings;
my $f= " Joe Bloggs, 1615 Thislane Street\n";
substr($f, 20, 12345, "This is a new longer address\n");
print $f;
substr has no problems making the string
longer. It's inserting new bytes where the first new
byte is beyond the end of the original scalar that
causes errors. So the following fails with the error
message you mention:
substr($f, length($f) + 10, 12345, "This is a new longer address\n");
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