RCsocial.net now supports full-text search!
The search box (first column, near top) already supported searches by hashtag (e.g. "#GospelToday") or user (e.g. "@George").
It will now return results for any text contained in past toots you touched (posted, received, favourited or boosted -- e.g. "liturgical color").
Techies: this optional feature of Mastodon is provided via integration with elasticsearch.