[wp-trac] [WordPress Trac] #40257: TinyMCE wpview: oEnbed previews are not shown if there is only a single line break before the URL

[WordPress Trac]

#40257: TinyMCE wpview: oEnbed previews are not shown if there is only a single
line break before the URL
--------------------------+----------------------------
 Reporter:  azaozz        |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Future Release
Component:  TinyMCE       |    Version:  4.4
 Severity:  normal        |   Keywords:  needs-patch
  Focuses:                |
--------------------------+----------------------------
 Follow up from Slack:
 https://wordpress.slack.com/archives/C02QB2JS7/p1490366664439760.

 When "embeddable" URLs are separated by only one line break, they work
 properly in PHP on the front-end but not in wpview in the editor.

 To reproduce paste the following in the Text editor then preview the post:
 {{{
 https://www.youtube.com/watch?v=3_uj1kedrNk
 https://videopress.com/v/zfu4XFD5
 }}}

 It works properly in the preview / on the front-end, but no instances of
 wpview are created when switching to the Visual editor.

 Happens because the PHP version of the regex that finds these URLs is
 quite different than the JS version. We should standardize it to the PHP
 version even if that introduces minor regressions (i.e. we show a preview
 for something that we didn't before), as the "true" functionality is on
 the front-end, wpview is just previews.

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Ticket URL: <https://core.trac.wordpress.org/ticket/40257>
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