#2 worked for me, but it will only work when the letter on each side of the colon is smallcase (The Case Sensitive box must be checked for this to work properly), so I agree that #3 is the better choice. You can also use [\w] instead of [a-zA-Z] to search for any letters and numbers on each side of the colon. Including the surrounding parentheses allows you to replace and can be omitted when you will replace manually.
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