• a [[language]]
  • [[wp]] https://en.wikipedia.org/wiki/Regular_expression pull
    • [[go]] [[wp]]
  • [[pull]] [[regexp]] [[regular expression]]
    • https://stackoverflow.com/questions/3058246/which-is-the-correct-shorthand-regex-or-regexp
  • I can’t believe they didn’t have a node until [[2021-05-30]].
    • I love [[regexes]].

katef/libfsm: DFA regular expression library & friends Implementing Regular Expressions https://github.com/aepsilon/turing-machine-viz visualize turing machines and dfas

http://phylactery.org/antimirov/ https://github.com/552-19sp/Mencius

type:: [[Function/On strings]]

• For Regular Expression (REGEX) [[Syntax]], see
  • xpath/regex specification
  • https://regexone.com/ #Tutorial
• Some frequent patterns
  • starts with "cat", case insensitive
    • REGEX (?s, "^cat", "i")
  • ends with "cat", case insensitive
    • REGEX (?s, "cat$", "i")
  • contains a digit
    • REGEX (?s, "[0-9]"), or
    • REGEX (?s, "\\d")
    • #+BEGIN_IMPORTANT Since the pattern is in a quoted string, the \ needs itself escaping, hence all character escaping need \\ #+END_IMPORTANT