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3. Matching Japanese Text Using Regular... Matching Japanese Text Using Regular Expressions

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   # How to Match Japanese Characters Using Regex (Javascript)

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   Regular expression, or regex it is also commonly known, is a useful tool for identifying patterns in strings. In Japanese, they are known as 正規表現 or seikihyōgen. These patterns can then be used for validation of inputs or for searching for specific strings. It's fairly easy to apply this to English, but what if you wanted to identify strings of Japanese characters? Until the advent of ES2015 one would have to know the appropriate unicode values for the characters in question. Now, however, one can simply add a `/u` flag to the end of the expression to allow the use of Japanese characters as they are.

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   In modern Japanese there are 4 character sets in common use, hiragana (a syllabary used primarily for native words), katakana (a syllabary used for foreign words affectation, and many other things), kanji (ideograms originally borrowed from Chinese that represent ideas, of which there are thousands), and rōmaji (the roman alphabet that English and many other western languages use)*.

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