Mr. Lance E Sloan sloanlance

Valid Email Addresses

Many websites attempt to validate email addresses based on formatting rules alone. Often, they use regular expressions which may turn out to be wrong, which is difficult to notice due to their complexity. Attempting to do very much validation of email addresses is usually a mistake and should be avoided.

The most common problem I've seen personally, from the perspective of a website user, is that email addresses containing a plus-sign (+) are considered invalid. For example, an email address like [email protected] is often rejected as invalid. However, that conclusion is incorrect.

According to RFC 3696 from the IETF, + is a valid character for the "local part" (the part before the @ sign).
According to RFC 5233, the [email protected] address is valid and the receiving mail server will deliver messages for that address to the user with the address

	#!/bin/bash

	# This is a draft but it works

	# FIRST (I don't even know if it works but we'll assume yes)
	# sudo launchctl list
	# sudo launchctl disable system/netbiosd
	# sudo launchctl disable system/parsecd
	# sudo launchctl disable system/parentalcontrols.check
	# sudo launchctl disable system/airportd

	#!/bin/sh --

	# Read numbers from stdin, one per line,
	# concatenate them with the addition operator between them,
	# and add them together with bc
	paste -sd+ - \| bc

	Gist title: XSLT for JSON

	Summary: In response to a Stack Overflow question about an XSLT equivalent for processing JSON,
	I posted an answer (http://stackoverflow.com/a/34910682/543738) suggesting DefiantJS. Also, a
	JSFiddle version (https://jsfiddle.net/lsloan/8dt9egjf/).

	#!/bin/sh --

	# The macOS "defaults domains" command writes a comma-delimited list of domains to stdout.
	# I wanted to get the domains as a list, one per line, without commas.

	# Inspired by:
	# http://stackoverflow.com/questions/723157/how-to-insert-a-newline-in-front-of-a-pattern
	# http://stackoverflow.com/questions/17363030/how-do-i-insert-a-newline-linebreak-after-a-line-using-sed

	# Default output

	defaults read com.apple.menuextra.clock
	#{
	# DateFormat = "EEE HH:mm";
	# FlashDateSeparators = 0;
	# IsAnalog = 0;
	#}

	defaults write com.apple.menuextra.clock DateFormat 'EEE HH:mm:ss'
	killall SystemUIServer

	Gist title: "BASH: ISO 8601 Timestamp with Milliseconds"

	Summary: How to get an ISO 8601 timestamp with milliseconds in BASH

	#!/usr/bin/python
	# -- coding: utf-8 --
	# From http://nedbatchelder.com/blog/200712/human_sorting.html

	import re


	def tryint(s):
	try:
	return int(s)