Regular expression for a language tag (as defined by BCP47)

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情书的邮戳 2021-02-05 18:52

I need a regular expression for a language tag as defined by BCP 47.

I know that the full BNF syntax is available at http://www.rfc-editor.org/rfc/bcp/bcp47.txt and th

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野趣味 (楼主)

2021-02-05 19:10

An optimized version that works in PHP.

/^(?(?:en-GB-oed|i-(?:ami|bnn|default|enochian|hak|klingon|lux|mingo|navajo|pwn|t(?:a[oy]|su))|sgn-(?:BE-(?:FR|NL)|CH-DE))|(?:art-lojban|cel-gaulish|no-(?:bok|nyn)|zh-(?:guoyu|hakka|min(?:-nan)?|xiang)))|(?:(?(?:[A-Za-z]{2,3}(?:-(?[A-Za-z]{3}(?:-[A-Za-z]{3}){0,2}))?)|[A-Za-z]{4}|[A-Za-z]{5,8})(?:-(?