(P2397)
Data type
External identifier
Statements
add a "website username" qualifier, using P554 (English)
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添加“网站用户名”限定符，使用P554 (Simplified Chinese)
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ajouter un qualificatif "website username", en utilisant P554 (French)
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https://youtube.com/channel/$1
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https://www.youtube.com/channel/$1
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https://music.youtube.com/channel/$1
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https://m.youtube.com/channel/$1
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UC[-_0-9A-Za-z]{21}[AQgw]
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Constraints
UC[-_0-9A-Za-z]{21}[AQgw]
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