Regex to test for presence of Japanese characters

JapaneseRegex.js

// REFERENCE UNICODE TABLES: 
// http://www.rikai.com/library/kanjitables/kanji_codes.unicode.shtml
// http://www.tamasoft.co.jp/en/general-info/unicode.html
//
// TEST EDITOR:
// http://www.gethifi.com/tools/regex
//
// UNICODE RANGE : DESCRIPTION
// 
// 3000-303F : punctuation
// 3040-309F : hiragana
// 30A0-30FF : katakana
// FF00-FFEF : Full-width roman + half-width katakana
// 4E00-9FAF : Common and uncommon kanji
// 
// Non-Japanese punctuation/formatting characters commonly used in Japanese text
// 2605-2606 : Stars
// 2190-2195 : Arrows
// u203B     : Weird asterisk thing

var regex = /[\u3000-\u303F]|[\u3040-\u309F]|[\u30A0-\u30FF]|[\uFF00-\uFFEF]|[\u4E00-\u9FAF]|[\u2605-\u2606]|[\u2190-\u2195]|\u203B/; 
var input = "input string"; 
if(regex.test(input)) {
    console.log("Japanese characters found")
}
else {
    console.log("No Japanese characters");
}

Thanks! It helps me

thx!

Thanks~!! It works

Why can't the initial few or conditions be consolidated into [\u3000-\u30FF]?

As a side note, the characters from 0x4e00 to 0x9faf include Chinese-only characters. The following code will give you a list of the standard 6355 Japanese kanji:

for (var i = 0x4e00, acc=[]; i < 0x9faf; i++) acc.push(String.fromCharCode(i));
var sortedChars = acc.sort(Intl.Collator("ja-JP").compare);
var level1Kanji = sortedChars.slice(0, 2965); // JIS X 0208 - Level 1 Kanji (2965 characters)
var level2Kanji = sortedChars.slice(2965, 6355) // JIS X 0208 - Level 2 Kanji (3390 characters)

Thanks! It helps me

Thanks, this helped me too.

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Big thank you, this helped a lot!

Thank you!

thank you!!

thx

thanks!

(y)

Thanks for such creative work.
Cheers

Thanks, super useful code!

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THANKS (Y)

This is perfect, thank you! 🥳

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OMG 🤯 🤯 🤯 Love it!

Thank you

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Works like a charm, thanks.

I believe this code is what the kids call "bussin"

Thanks you

the g is unnecessary and can cause bugs because it introduces state into the regex that affects subsequent calls to .test

@aehlke wow, long time no see! I’ll edit it lol

hey @ryanmcgrath it's been a long time indeed! I have this snippet in an older part of my app and hadn't realized it's from you :D hope you're doing well, and thanks for the edit