is
Tests whether the specified string can be encoded as a segment in kanji mode. Broadly speaking, the set of encodable characters are {kanji used in Japan, hiragana, katakana, East Asian punctuation, full-width ASCII, Greek, Cyrillic}. Examples of non-encodable characters include {ordinary ASCII, half-width katakana, more extensive Chinese hanzi}.
Return
true iff each character is in the kanji mode character set
Parameters
text
the string to test for encodability (not null)
See also
.makeKanji
Throws
if the string is null