That's presumably because the error had some format including rows columns and filenames.
Navigating from a symbol to another symbol (e.g. from a variable use to its declaration) requires more than simple pattern matching.
The editor needs to know (or be able to find out) the symbolic meaning of every word on the screen to do that. If syntax hihglighting isn't just basic regex matching, e.g. if you want different colors for mutable/immutable fields etc, then the editor needs to know the syntactic meaning of everything not just when navigating but when displaying.
Navigating from a symbol to another symbol (e.g. from a variable use to its declaration) requires more than simple pattern matching.
The editor needs to know (or be able to find out) the symbolic meaning of every word on the screen to do that. If syntax hihglighting isn't just basic regex matching, e.g. if you want different colors for mutable/immutable fields etc, then the editor needs to know the syntactic meaning of everything not just when navigating but when displaying.