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A valid cut is one that isn't followed by a continuation byte (0b10xx_xxxx).

sub truncate_utf8 { my ($utf8, $len) = @_; $len += 0; # Make sure $len is a number. return $utf8 =~ s/^.{0,$len}\K(?![\x80-\xBF]).*//sr; }
sub truncate_utf8 { my ($utf8, $len) = @_; return $utf8 if length($utf8) <= $len; my $next = substr($utf8, $len, length($utf8)-$len, ''); $next = chop($utf8) while (ord($next) & 0xC0) == 0x80; return $utf8; }

Both of these take text that is already encoded using UTF-8.

Update: Fixed typo mentioned by haukex.
Update: Made clear what the input should be.

In reply to Re: truncate string to byte count by ikegami
in thread truncate string to byte count by morgon

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