What regex should be applied when selecting text between unknown XML tags but not the tags themselves?

Question

As the title suggests e.g.

<unknownTag>Select this only</unknownTag>
<anotherUnknownTag>Select this too</anotherUnknownTag>

To select: - Select this only - Select this too

A brief explanation on separate parts would be nice too if possible.

Answer 1

You can use this regex.

(?!<.+?>)([^<>]+?)(?=</.+?>)