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This is how I’m turning any tags into a simple map of strings (in Go, but it’s just an example of simple string splits).
This is after splitting out the tag part of the message, not including @ or trailing space.

func tagsToMap(tagString string) map[string]string {
    result := make(map[string]string)
    splitTags := strings.Split(tagString, ";")
    for _, tag := range splitTags {
        splitTag := strings.SplitN(tag, "=", 2) 
        result[splitTag[0]] = splitTag[1]
    }
    return result
}

Then no matter if tags are added or removed or which order they are in, we have a simple map that we can use instead of unwieldy regex. (The example should properly catch any tags as defined by specification).

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