* 仕様書

[REFS[
- [1] [CITE@en[URL Standard]] ([TIME[2016-02-15 18:33:32 +09:00]] 版) <https://url.spec.whatwg.org/#ascii-alphanumeric>
- [5] [CITE@en-GB-x-hixie[HTML Standard]] ([TIME[2016-04-09 09:15:24 +09:00]] 版) <https://html.spec.whatwg.org/#alphanumeric-ascii-characters>
]REFS]

* 意味

[3] [DFN[[RUBYB[ASCII英数字]@en[ASCII alphanumeric]]]] [SRC[>>1]]
([DFN[alphanumeric SACII characters]] [SRC[>>5]]) は、
[[ASCII英字]]と[[ASCII数字]]です。

* 文字の一覧

[REFS[
- [2] [CITE@en[Character set "ASCII alphanumeric"]] ([TIME[2016-03-06 23:08:23 +09:00]] 版) <https://chars.suikawiki.org/set/%24url%3AASCII-alphanumeric>
- [6] [CITE@en[Character set "alphanumeric ASCII characters"]] ([TIME[2016-03-06 23:08:23 +09:00]] 版) <https://chars.suikawiki.org/set/%24html%3Aalphanumeric-ASCII-characters>
]REFS]

* 関連

[4] [[ASCII十六進数字]]はすべて[[ASCII英数字]]です。

* 歴史

[7] [CITE@en[Refactor tag states and actions (#994) · whatwg/html@b66ec32]]
([TIME[2016-04-09 12:49:17 +09:00]] 版)
<https://github.com/whatwg/html/commit/b66ec320db01c12d48176052c3b9cd55a10f3176>

[8] [CITE@en[Editorial: start using the Infra Standard]]
([[annevk]]著, [TIME[2016-11-21 20:23:59 +09:00]])
<https://github.com/whatwg/url/commit/9001b9be7475fdf4a7a2757b5417aa4a9f06b3b6>

[9] [CITE@en[Editorial: use more terms from the Infra Standard]]
([[annevk]]著, [TIME[2017-02-08 17:12:54 +09:00]])
<https://github.com/whatwg/html/commit/104bd78697738af2eab61740a2f1421ae49a3c95>


[10] 
[CITE@en[rfc4151]], [TIME[2021-08-18T06:01:57.000Z]] <https://datatracker.ietf.org/doc/html/rfc4151#section-2.1>