Structural regexes as found in the sam editor are an obscure but well engineered regex engine. I am far from an expert but my main takeaway from them is that mo

Structural regexes as found in the sam editor are an obscure but well engineered regex engine. I am far from an expert but my main takeaway from them is that most regex engines have an implied structure built around "lines" of text. While you can work around this, it is awkward. Structural regexes allow you to explicitly define the structure of a match, that is, you get to tell the engine what a "line" is. http://man.cat-v.org/plan_9/1/sam http://man.cat-v.org/plan_9/1/sam