如何使用正則表達式驗證文化代碼？

Question

我真的不理解正則表達式，我也無法找到任何正則表達式規則來驗證文化代碼，如：en-GB，en-UK，az-AZ-Cyrl等。

如何使用正則表達式驗證這些代碼？

Answer 1

你可以用這個驗證：

/^[a-z]{2,3}(?:-[A-Z]{2,3}(?:-[a-zA-Z]{4})?)?$/ 

這裏是它如何工作的

^  <- Starts with 
[a-z] <- From a to z (lower-case) 
{2,3} <- Repeated at least 2 times, at most 3 
(?:  <- Non capturing group 
    -  <- The "-" character 
    [A-Z]  <- From a to z (upper-case) 
    {2,3}  <- Repeated at least 2 times, at most 3 
    (?:  <- Non capturing group 
     -   <- The "-" character 
     [a-zA-Z] <- from a to Z (case insensitive) 
     {4}  <- Repeated 4 times 
    )   <- End of the group 
    ?   <- Facultative 
)  <- End of the group 
?  <- Facultative 
$  <- Ends here 

您還可以通過(?:-(?:Cyrl|Latn))?替換最後一個非捕獲組，如果唯一選項是Cyrl和LATN

Answer 2

這是我在Dublin Core/W3C xsd中找到的：http://www.w3.org/2001/XMLSchema

<xs:simpleType name="language" id="language"> 
    <xs:annotation> 
     <xs:documentation 
     source="http://www.w3.org/TR/xmlschema-2/#language"/> 
    </xs:annotation> 
    <xs:restriction base="xs:token"> 
     <xs:pattern 
     value="[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})*" 
       id="language.pattern"> 
     <xs:annotation> 
      <xs:documentation 
       source="http://www.ietf.org/rfc/rfc3066.txt"> 
      pattern specifies the content of section 2.12 of XML 1.0e2 
      and RFC 3066 (Revised version of RFC 1766). 
      </xs:documentation> 
     </xs:annotation> 
     </xs:pattern> 
    </xs:restriction> 
    </xs:simpleType> 

然後模式是：

[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})* 

Answer 3

https://en.wikipedia.org/wiki/IETF_language_tag根據正則表達式可以是：

/^[a-z]{2,3}(?:-[a-zA-Z]{4})?(?:-[A-Z]{2,3})?$/ 

來自維基：

單個初級語言子標記基於一個雙來自ISO 639-1（2002）的字母語言代碼或來自ISO 639-2（1998），ISO 639-3（2007）或ISO 6的三字母代碼39-5（2008），或通過BCP 47程序註冊，由五至八個字母組成;

可選腳本子標籤，基於來自ISO 15924的四個字母的腳本代碼（通常寫在標題大小寫中）;

基於來自ISO 3166-1 alpha-2（通常用大寫字母書寫）的雙字母國家代碼的可選區域子標籤或來自UN M.49的地理區域的三位代碼;

Answer 4

^（？i：AF | AX | AL | DZ | AS | AD | AO | AI | AQ | AG | AR | AM | AW | AU | AT | AZ | BS | BH | BD | BB | BY | BE | BZ |北京| BM | BT | BO | BQ | BA | BW | BV | BR | IO | BN | BG | BF | BI | KH | CM | CA |簡歷| KY | CF | TD | CL | CN | CX | CC |公司| KM | CG | CD | CK | CR | CI | HR | CU | CW | CY | CZ | DK | DJ | DM | DO | EC | EG | SV | GQ | ER | EE | ET | FK | FO | FJ | FI | FR | GF | PF | TF | GA |通用| GE | DE | GH | GI | GR | GL |廣東| GP | GU | GT | GG | GN | GW | GY | HT | HM | VA | HN | HK | HU | IS | IN | ID | IR | IQ | IE | IM | IL | IT | JM | JP | JE | JO | KZ | KE | KI | KP | KR | KW | KG | LA | LV | LB | LS | LR | LY | LI | LT | LU | MO | MK | MG | MW | MY | MV | ML | MT | MH | MQ | MR | MU | YT | MX | FM | MD | MC | MN | ME | MS | MA | MZ | MM | NA | NR | NP | NL | NC | NZ | NI | NE | NG | NU | NF | MP | NO | OM | PK | PW | PS | PA | PG | PY | PE | PH | PN | PL | PT | PR | QA |地產| RO | RU | RW | BL | SH | KN | LC | MF |發短消息| VC | WS | SM | ST | SA | SN | RS | SC | SL | SG | SX | SK | SI | SB | SO | ZA | GS | SS | ES | LK | SD | SR | SJ | SZ | SE | CH | SY | TW | TJ | TZ | TH | TL | TG | TK | TO | TT | TN | TR | TM | TC |電視| UG | UA | AE | GB |美| UM | UY | UZ | VU | VE | VN | VG | VI | WF | EH | YE | ZM | ZW）$