[wp-trac] [WordPress Trac] #49464: wp_kses_hair and wp_kses_hair_parse regex is not allowing digits or underscores in attribute names

[WordPress Trac]

#49464: wp_kses_hair and wp_kses_hair_parse regex is not allowing digits or
underscores in attribute names
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 Reporter:  codeforest                |       Owner:  (none)
     Type:  defect (bug)              |      Status:  new
 Priority:  normal                    |   Milestone:  5.5
Component:  Formatting                |     Version:  5.3.2
 Severity:  major                     |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:
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Comment (by ayeshrajans):

 Hi @codeforest - welcome to WordPress Trac!
 You are right the regex for HTML attributes do not follow the standard,
 and your patch fixes it.

 There is a small chunk in the patch (under `valid_unicode` function) that
 only has changes in indentation, so I will reroll the patch with those
 alignments fixed.

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Ticket URL: <https://core.trac.wordpress.org/ticket/49464#comment:9>
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