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

[WordPress Trac]

#49464: wp_kses_hair and wp_kses_hair_parse regex is not allowing digits 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 needs-unit-tests  |     Focuses:
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Comment (by zodiac1978):

 This would fix a bug I was examining exactly at the same time.
 `wp_kses_post` is stripping out "data-" attributes if they are containg
 underscores, like `data-test_test`.

 $test1 = wp_kses_post('<a href="http://google.de">Google</a>');

 $test2 = wp_kses_post('<a data-test="xxx"
 href="http://google.de">Google</a>');

 $test3 = wp_kses_post('<a data-test_test="yyy"
 href="http://google.de">Google</a>');

 1 and 2 would be fine, but for 3 the attribute gets stripped out.

 The RegEx from the patch would solve this:

 Before patch:
 https://regex101.com/r/bAeYTE/1

 After patch:
 https://regex101.com/r/Hbnfmo/1

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Ticket URL: <https://core.trac.wordpress.org/ticket/49464#comment:3>
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