But then I could not guarantee that the output is exactly the same as the input outside of the specific values being updated.
DOM-tree<-->wiki-syntax is a one-to-many relationship, for example each of the following is a valid wiki-syntax representation of a table row containing 3 cells with the contents A, B, and C:
| A || B || C
Also, I doubt that writing a full-blown parser and serializer would result in less work and less code than a regex-based solutions supported by linked substrings.
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