- char-set:blankconstant
Blank chars are horizontal whitespace. In Unicode, a blank character is either
- a character with the space separator category (Zs) in the Unicode character database.
- U+0009 Horizontal tabulation (\t control-I)
There are eighteen blank characters in Unicode 3.0:
0009 HORIZONTAL TABULATION \t control-I 0020 SPACE Zs 00A0 NO-BREAK SPACE Zs 1680 OGHAM SPACE MARK Zs 2000 EN QUAD Zs 2001 EM QUAD Zs 2002 EN SPACE Zs 2003 EM SPACE Zs 2004 THREE-PER-EM SPACE Zs 2005 FOUR-PER-EM SPACE Zs 2006 SIX-PER-EM SPACE Zs 2007 FIGURE SPACE Zs 2008 PUNCTUATION SPACE Zs 2009 THIN SPACE Zs 200A HAIR SPACE Zs 200B ZERO WIDTH SPACE Zs 202F NARROW NO-BREAK SPACE Zs 3000 IDEOGRAPHIC SPACE Zs The ASCII blank characters are the first two characters above -- horizontal tab and space. Latin-1 adds the no-break space.