Allow multi-word corrections (regex?)

[tobiasdiez]

Sometimes the words in itself are correct, but are not used in the correct (grammatical) sense. Examples include

• right hand side > right-hand side
• infinite dimensional > infinite-dimensional
• former or later > former or latter

It would be nice if such expressions could be captured as well.

Perhaps it's an idea to have a expressions group in the config (similar to words) which then matches using regular expressions. Could be used to implement project-specific rules (e.g. if a command is deprecated or a certain multi-word expression shouldn't be used).

(In the other direction, this would be #795. It's also related to #400.)