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Validating a Hex Value

/^#?([a-f0-9]{6}|[a-f0-9]{3})$/

Summary

A Regular expression, or Regex, is a method of validating a specific piece of text by use of a sequence of characters each including their own fundimental principles. Regex can be used to validate emails, hex values, URLs, and HTML. In this case we will be focusing on Hex values which are typically a # with 6 numbers or letters following it.

Basic Tetris HTML and JavaScript Game

This is a basic implementation of the game Tetris, but it's missing a few things intentionally and they're left as further exploration for the reader.

Further Exploration

Score
When a line is cleared, the score should increase based on the number of lines cleared at once. See https://tetris.fandom.com/wiki/Scoring

Creating URL slugs properly in PHP (including transliteration for UTF-8)

The point to use a slug (semantic URL) besides of improve the SEO of your articles is to prevent that the user, at the creation of for example an article, it uses special characters that aren't allowed in a URL, appropiate the usage etc. What target usage means, is context dependent.

In this article, you'll learn how to slugify a string in PHP properly, including (or not) support (conversion) for cyrilic and special latin characters.

Slugify in PHP

The following function exposes a simple way to convert text into a valid slug:

	import os, sys
	import subprocess

	def printToPrnter(name, city):
	data = "^XA" \
	"^FO200,30^ADN,30,20^FB400,3,0,C^FD"+name+"^FS" \
	"^FO200,80^ADN,30,20^FB400,3,0,C^FD"+city+"^FS" \
	"^XZ"

	try:


	from flask import Flask, request, jsonify
	import json
	from printToPrinter import printToPrnter
	import textwrap

	app = Flask(__name__)


	@app.route('/')

	import React from 'react'

	const CountDownTimer = ({hoursMinSecs}) => {

	const { hours = 0, minutes = 0, seconds = 60 } = hoursMinSecs;
	const [[hrs, mins, secs], setTime] = React.useState([hours, minutes, seconds]);


	const tick = () => {

	worker_processes 1;

	events {
	worker_connections 1024;
	}

	http {
	map $http_user_agent $outdated {
	default 0;
	"~MSIE [1-10]\." 1;