Question

I am trying to read input and pass it only if it is a Japanese kanji. That means the character falls somewhere between 4e00 and 9faf, according to http://www.rikai.com/library/kanjitables/kanji_codes.unicode.shtml

Is it possible using Javascript to test over this range?

Answer 1

/[\u4e00-\u9faf]+/ should do it. That matches one or more characters in the range 4e00 - 9faf.

From the the MDN documentation:

\uhhhh Matches the character with the code hhhh (four hexadecimal digits).

So in your case, if you want to test the whole string, you probably want:

if(/^[\u4e00-\u9faf]+$/.test(str)) {
    // str is a kanji
}