compute: require strict regular expression patterns

Created by: rvantonder

compute regex capture group results will diverge depending on case. When we get the capture groups, it's always case sensitive. When we search, by default we are case-insensitive (ok?). This treats the search case sensitive by default. But it also needs to make the capture group regex insensitive when case:no is set.

Somewhere in our code, we are defaulting to non-case-sensitive regular expressions (zoekt?) and it's outside of the parser/planning phase, which is why keeping the above in sync is difficult right now without doing a lot of extra legwork.