How can I check whether a given string contains one or more Japanese characters (consisting of kana and/or kanji)?
I saw a similar question here: How can I check if variable contains Chinese/Japanese characters? , and I used the solution to come up with this:
var containsJapanese = string.match(/[\u3400-\u9FBF]/);
However, this gives many false positives.
I’ve tested it by having a script iterate through the contents of entire web pages– such as Facebook, Stack Overflow, etc.– and marking the divs which supposedly contain Japanese text. In those cases, a large number of divs end up getting marked by mistake. I’ve also tested it on pages that do contain Japanese text, and the Japanese divs there end up getting marked correctly alongside many incorrectly-marked divs.
Check whether this works or not. I found this website that seems to list all the characters in Unicode that might be used in Japanese text.
The corresponding regex (for single character) would be:
/[\u3000-\u303f\u3040-\u309f\u30a0-\u30ff\uff00-\uff9f\u4e00-\u9faf\u3400-\u4dbf]/ -------------_____________-------------_____________-------------_____________ Punctuation Hiragana Katakana Full-width CJK CJK Ext. A Roman/ (Common & (Rare) Half-width Uncommon) Katakana
The ranges are (as quoted from the site):
3000 - 303f: Japanese-style punctuation
3040 - 309f: Hiragana
30a0 - 30ff: Katakana
ff00 - ff9f: Full-width Roman characters and half-width Katakana
4e00 - 9faf: CJK unified ideographs – Common and uncommon Kanji
3400 - 4dbf: CJK unified ideographs Extension A – Rare Kanji
I have changed the ranges a bit:
- I have changed from
ff00 - ffefto
ff00 - ff9ffor Full-width Roman characters and half-width Katakana. The code points from
ffa0 - ffdccontains Hangul half-width characters, which is not what you want. You may want to re-add the code points from
ffe0 - ffef, but they are mostly half-width punctuations or full-width currency symbols.
You can check the site and take off any range you don’t want, or are sure that it will not appear in your input.
Answered By – nhahtdh
Answer Checked By – Marilyn (BugsFixing Volunteer)