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Asked: 2026-05-10T18:43:52+00:00

I’m looking for a way to match only fully composed characters in a Unicode

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I’m looking for a way to match only fully composed characters in a Unicode string.

Is [:print:] dependent upon locale in any regular expression implementation that incorporates this character class? For example, will it match Japanese character ‘あ’, since it is not a control character, or is [:print:] always going to be ASCII codes 0x20 to 0x7E?

Is there any character class, including Perl REs, that can be used to match anything other than a control character? If [:print:] includes only characters in ASCII range I would assume [:cntrl:] does too.

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  1. echo あ| perl -nle 'BEGIN{binmode STDIN,':utf8'} print'[$_]'; print /[[:print:]]/ ? 'YES' : 'NO''

    This mostly works, though it generates a warning about a wide character. But it gives you the idea: you must be sure you’re dealing with a real unicode string (check utf8::is_utf8). Or just check perlunicode at all – the whole subject still makes my head spin.

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