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text = "Hi &lt;p class=\"hello\"&gt;\r\nthere, how are you\r\n&lt;/p&gt;"
puts text.gsub(/(&lt;.*?&gt;)|[[:blank:]]/m) { $1 || '_' }

Success #stdin #stdout 0.01s 6368KB

stdin

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Standard input is empty

stdout

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Hi_&lt;p class="hello"&gt;
there,_how_are_you
&lt;/p&gt;

https://ideone.com/7X2ohK

language:

Ruby (ruby 2.5.5)

created:

visibility:

secret

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