Delete all comment lines in Sublime Text 3

To delete all specific <tag> element including contents inside it:

• Ctrl + H (on PC)
• Enable (Regular Expression): .* icon or Alt + R
• Find What:

  RE syntax to work with a particular tag,

  (?s)<start tag>.*?<end tag>

  Such as, for CSS comment tags,

  (?s)/*.*?*/

  For HTML comment tags,

  (?s)<!--.*?-->

• Replace With: Leave the field blank
• Replace All