invisibleWhitespace constant
String
const invisibleWhitespace
all Unicode space characters with White_Space=no
taken from https://en.wikipedia.org/wiki/Whitespace_character
Implementation
static const invisibleWhitespace = '\u{180E}'
'\u{200B}'
'\u{200C}'
'\u{200D}'
'\u{2060}'
'\u{200B}'
'\u{FEFF}'
'\u{2060}'
'\u{200B}';