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                                            Johnny Boulch

Certain languages can't be matched correctly by the Regular Expression EXT_VALUE_REGEXP like en-US or zh_cn

I'm so sorry, they seem to be out of this spec.I didn't know this The Language Tag Spec before.But why can the chrome browser can parse the attachment's name correctly...

Certain languages can't be matched correctly by the Regular Expression EXT_VALUE_REGEXP like en-US or zh_cn

I read the spec in https://datatracker.ietf.org/doc/html/rfc5646#section-2.1. the spec about the language region is 2ALPHA or 3DIGIT.In other words,en-US meets the language tag specification.But for EXT_VALUE_REGEXP, /-A-Za-z]{3}){0,3}/ states '-' must be...