xah talk show 2022-07-22 emacs lisp, parse url, regex, trigram, hexagram

• demo XahLee.info Search 🔍
• demo Unicode Search 🔎
• demo xah-cite
• demo xah-open-file-from-clipboard
• JS: Get URL (window.location)
• JS: Update URL Query String Parameter (window.location , window.history.pushState)
• emacs lisp tutorial, write code to parse url. on query string and hash fragment part
• emacs lisp, find builtin lib to parse url

• trigram, hexagram, korean flag.
• http://xahlee.org/music/the_grandmaster_kungfu.html

• http://xahlee.info/xli_search.html?q=emacs+lisp+list
• http://xahlee.info/comp/unicode_index.html?q=heart
• http://xahlee.info/comp/unicode_index.html?q=mono
• http://xahlee.info/comp/unicode_dingbats.html
• http://xahlee.info/xli_search.html?q=percent

• Combinatorics
• Emacs: Eww Web Browser
• ELisp: URL Percent Decode/Encode
• ELisp: URL Percent Encode/Decode using JavaScript
• Emacs: URL Percent Decode/Encode
• URL Percent Encoding and Ampersand Char
• URL Percent Encoding and Unicode

• Unicode: Math Symbols ∑ ∫ π² ∞

(defun xparseURL (xurl)
  "parse xurl, return a list of parts
version 2022-07-22"
  (interactive)
  (let (xprotocol xhost xport xresourcePath xfrag)
    ;; "http://www.example.com:80/a/b/c?x=1&y=2#frag"
    (string-match "^\\([a-zA-Z0-9]+\\)://\\([.a-zA-Z0-9]+\\):\\([0-9]+\\)/\\([/%a-zA-Z0-9]+\\)\\?\\([&%=a-zA-Z0-9]+\\)#\\([.a-zA-Z0-9]+\\)" xurl)
    (setq xprotocol (match-string 1 xurl))
    (setq xhost (match-string 2 xurl))
    (setq xport (match-string 3 xurl))
    (setq xresourcePath (match-string 4 xurl))
    (setq xfrag (match-string 5 xurl))
    (list xprotocol xhost xport xresourcePath xfrag)))

(xparseURL "http://www.example.com:80/a/b/c?x=1&y=2#frag")

(require 'url-parse)
(url-generic-parse-url "http://www.example.com:80/a/b/c?x=1&y=2#frag")