RegEx/Tag.regex.txt

\< # The tag Start
(?<TagName>\w+) # The name of the Tag is any non number of non-word characters
(?<TagAttributes> # It's attributes are
    .+? # anything until
    (?= # the close of the tag.
        (?> # The close of the tag can be either (IsClosed)/> or (IsOpen)>
            (?<IsClosed>/>)|(?<IsOpen>>)
        )
    )
)
(?(IsOpen)(?: # If the tag was open
        > # match the end tag (so that it's not captured as TagContent)
        (?<TagContent> # then capture the tag content
                (?>
                    (.|\s)+?(?!<\k<TagName>)|
                    (?=\<\k<TagName>)(?<TagDepth>)|
                    (?=\<\/\k<TagName>)(?<-TagDepth>)
                )*(?(TagDepth)(?!))
                              # It is anything until
        )(?=\<\/\k<TagName>) # the closing tag
        (?:\<\/\k<TagName>>)
    )
)