Permalink to Table of ContentsTable of Contents

• Quick Take
• Match registered tags without regard to letter case
• Explain a language tag containing two region subtags
• Explain an extended language subtag with the wrong prefix
• Validate an extended language subtag after its registered prefix
• Validate multiple uniquely prefixed extensions
• Accept an IANA-grandfathered language tag
• Reject text that does not resemble a language tag
• Validate a private-use language tag
• Explain why a repeated variant is invalid
• Validate language, script, region, and variant subtags together
• Explain an extension singleton without extension content
• Various examples

Permalink to Quick TakeQuick Take

Permalink to Match registered tags without regard to letter caseMatch registered tags without regard to letter case

Permalink to Explain a language tag containing two region subtagsExplain a language tag containing two region subtags

Permalink to Explain an extended language subtag with the wrong prefixExplain an extended language subtag with the wrong prefix

Permalink to Validate an extended language subtag after its registered prefixValidate an extended language subtag after its registered prefix

Permalink to Validate multiple uniquely prefixed extensionsValidate multiple uniquely prefixed extensions

Permalink to Accept an IANA-grandfathered language tagAccept an IANA-grandfathered language tag

Permalink to Reject text that does not resemble a language tagReject text that does not resemble a language tag

Permalink to Validate a private-use language tagValidate a private-use language tag

Permalink to Explain why a repeated variant is invalidExplain why a repeated variant is invalid

Permalink to Validate language, script, region, and variant subtags togetherValidate language, script, region, and variant subtags together

Permalink to Explain an extension singleton without extension contentExplain an extension singleton without extension content

Permalink to Various examplesVarious examples