Rob Pike has published several great papers about sam, the Plan 9 text editor he wrote. 1. General overview of the editor; maybe scroll to the "Implementation"

Rob Pike has published several great papers about sam, the Plan 9 text editor he wrote. 1. General overview of the editor; maybe scroll to the "Implementation" section here: http://doc.cat-v.org/plan_9/4th_edition/papers/sam/ http://doc.cat-v.org/plan_9/4th_edition/papers/sam/ Some of the references at the end of that paper may also be relevant or interesting. 2. Tutorial for the command language: http://doc.cat-v.org/bell_labs/sam_lang_tutorial/sam_tut.pdf http://doc.cat-v.org/bell_labs/sam_lang_tutorial/sam_tut.pdf 3. And explanations on structural regular expressions that sam uses: http://doc.cat-v.org/bell_labs/structural_regexps/se.pdf http://doc.cat-v.org/bell_labs/structural_regexps/se.pdf 4. Pike's paper representing Acme, the (sort-of) follow-up editor of sam: http://doc.cat-v.org/plan_9/4th_edition/papers/acme/ http://doc.cat-v.org/plan_9/4th_edition/papers/acme/