- Xapian (and hence notmuch) prefixes are either <b>boolean</b>, supporting
- exact matches like "<u>tag:inbox</u>" or <b>probabilistic</b>, supporting a more
- flexible <b>term</b> based searching. Certain <b>special</b> prefixes are processed
- by notmuch in a way not strictly fitting either of Xapian's built in
+ Xapian (and hence notmuch) prefixes are either <b>boolean</b>, supporting ex‐
+ act matches like "<u>tag:inbox</u>" or <b>probabilistic</b>, supporting a more flexi‐
+ ble <b>term</b> based searching. Certain <b>special</b> prefixes are processed by
+ notmuch in a way not strictly fitting either of Xapian's built in