Archive for January 23rd, 2019

Okay, in part one I showed you what I’ve learned about writing regular expression engines in Haskell. The example shown uses Haskell chars, so is unicode-compliant. I also mentioned a semiring. Here’s what a Haskell semiring’s class looks like. (A Haskell ‘class’ is more like a Trait in Rust, or an Interface is Java; it […]

I’ve been working my way through A Play on Regular Expressions, a programming pearl by Sebastian Fischer, Frank Huch, and Thomas Wilke on the use of weighted values in regular expressions. The paper has six parts, and I’ve understood everything up through part two, and what I’ve understood already blows my mind. I recently put […]


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