Java Regex UTF-8

You may find Java doing unpredictable behaviors when you use Pattern class for regular expressions on non-Roman alphabets.
You’d better check first if your string is encoded right, especially when you read the string from text files.
If this is the case, try
BufferedReader file = new BufferedReader(new InputStreamReader(new FileInputStream(filePath),"UTF8"));

Java Regex UTF-8

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