#reStructuredText follows the logic that underlined text means that it's a link, so it doesn't have dedicated syntax for (non-link) underlined text either. Support can be added with this syntax

.. role:: underline
:class: underline

:underline:`this`

in combination with a short #LuaFilter

function Span(s)
return s.classes[1] == 'underline' and pandoc.Underline(s.content) or nil
end

#pandoc #rst #underline

#Underline text in different lightweight markup languages:

Emacs #OrgMode :orgmode:, Muse:
_this_

#DokuWiki:
__this__

#Textile, #Jira
+this+

There is no Markdown syntax for underlined text, but #pandoc's #Markdown reader treats the content of spans with class "underline" or "ul" as #underlined:

[important]{.underline}
[nota bene]{.ul}

#International_Tech_News | #President_Putin says #Russia will enforce #ROUBLE Payments for #Gas, Prepared to #HALT #CONTRACTS.

~..and I want to #underline this, AT #PRICES THAT ARE #SET IN #CURRENT #LONG_TERM #CONTRACTS.~

https://youtu.be/Qc5hwRAXVXs

Disclaimer: DavidV.TV and/or its owners (Tastingtraffic LLC) are not affiliates of this provider or referenced image used and this is NOT a Sponsored (Paid) Promotion/.

RT @jungleking: #UnderLine REALITY Studioでライブ制作のお手伝いをさせていただきました。出演者のみなさまも視聴者のみなさまも楽しんでいただけて良かったです！ https://t.co/BAEJBZdEmO

RT @Botan_v: #UnderLine
#REALITY
かっこいいよ大好きだよにんにん https://t.co/2qWPm51LCZ