Are all non-printable characters control characters?

Question

Does this (perldoc unicode) mean that all non-printable characters are control-characters?

\p{Print}

This matches any character that is graphical or blank, except controls.

I was not sure about the sentence - it sounds to me that controls are a part from graphical/blank. — sid_com, Jul 21 '12 at 16:49
@DVK That would be the Unicode `General_Category=Control` character property, aka `gc=Cc`. — tchrist, Jul 22 '12 at 23:12

score 4 · Answer 1 · answered Jul 21 '12 at 17:44

4

This will tell you for sure:

diff -U0 \
      <( unichars -au '\P{Print}'   ) \
      <( unichars -au '\p{Control}' ) \
   && echo No differences

unichars comes from Unicode::Tussle

I can't run it before Monday.

answered Jul 21 '12 at 17:44

ikegami

1

`unichars -gas '\P{print}' '\P{control}'` shows that there are two such code points, U+2028 GC=Zl `LINE SEPARATOR` and U+2029 GC=Zp `PARAGRAPH SEPARATOR`. – tchrist Jul 22 '12 at 23:16
Thanks. The DB_File dependency of one of the dependencies is problematic. – ikegami Jul 23 '12 at 14:48

score 1 · Accepted Answer · answered Jul 21 '12 at 09:03

1

If invisible whitespace/blank characters are considered printable, then yes, that only leaves control characters as unprintable.

But if you don't consider whitespace/blank characters such as line separator printable, then no.

answered Jul 21 '12 at 09:03

Esailija

2 Answers2