Check if a string contains a Japanese letter

Question

I read this answer on stackoverflow that explained how a Japanese letter on a string could be detected. I tried searching for something similar to string.match() in the String Class documentation but didn't find anything.

I also tried implementing the Best Answer from this post but it didn't work as well, does anyone have a suggestion on how can this be achieved? the output of the code below is false but it should be true.

String message = 'EnglishLetters - みずずほダイレクト'; String regex = '/[\u3040-\u30ff\u3400-\u4dbf\u4e00-\u9fff\uf900-\ufaff\uff66-\uff9f]/'; Pattern regexPattern = Pattern.compile(regex); Matcher regexMatcher = regexPattern.matcher(message); String replacedMessage; if(regexMatcher.find()) { system.debug('true'); } else{ System.debug('false'); } //output: false

Adrian Larson · Accepted Answer · 2017-05-29 22:27:48Z

You don't wrap expressions in forward slashes when using Apex.

String regex = '/[............]/'; // ^ remove these ^

Working example:

String message = 'EnglishLetters - みずずほダイレクト'; String regex = '[\u3040-\u30ff\u3400-\u4dbf\u4e00-\u9fff\uf900-\ufaff\uff66-\uff9f]'; Pattern regexPattern = Pattern.compile(regex); Matcher regexMatcher = regexPattern.matcher(message); system.assert(regexMatcher.find());

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