Sexy Lexing with Python | Evan Fosmark
http://www.evanfosmark.com/2009/02/sexy-lexing-with-python/

Lexical analysis, a daunting task right? Wrong! In the following document we'll walk through different methods of lexical scanning in Python. First, we'll look

正規表現では対応できない構文解析。

見切りというよりは適材適所。正規表現は入れ子と相性が悪いのでちゃんと構文解析しましょうと。