Krystian Graba KrystianGraba

Matching an Email: A Tutorial

A regex, which is short for regular expression, is a sequence of characters that defines a specific search pattern. When included in code or search algorithms, regular expressions can be used to find certain patterns of characters within a string, or to find and replace a character or sequence of characters within a string. They are also frequently used to validate input.

Summary

I will be teaching you how to make a regex for an email validation and describing which parts of the regex describe what.

/^([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})$/

	# ------------------------------------------------
	# Config files are located in /etc/wireguard/wg0
	# ------------------------------------------------

	# ---------- Server Config ----------
	[Interface]
	Address = 10.10.0.1/24 # IPV4 CIDR
	Address = fd86:ea04:1111::1/64 # IPV6 CIDR
	PostUp = iptables -A FORWARD -i wg0 -j ACCEPT; iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE; ip6tables -A FORWARD -i wg0 -j ACCEPT; ip6tables -t nat -A POSTROUTING -o eth0 -j MASQUERADE # Add forwarding when VPN is started
	PostDown = iptables -D FORWARD -i wg0 -j ACCEPT; iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE; ip6tables -D FORWARD -i wg0 -j ACCEPT; ip6tables -t nat -D POSTROUTING -o eth0 -j MASQUERADE # Remove forwarding when VPN is shutdown

	for (int i = 0 ; i< lenght_size;i++){
	for (int j=0;j< obiekt_array_list.size();j++){
	if (obiekt_array_list.get(j).get_number(i) == Integer.parseInt(String.valueOf(gamma.charAt(i))))
	if (obiekt_array_list.size()>2)
	//code
	}
	}

	#!/bin/bash
	for zmienna in {1..100}
	do
	zmienna="$((zmienna+3))"
	if [ $(echo "$zmienna % 3" \| bc) -eq 0 ]
	then
	#echo "podzielna: $zmienna"
	case $zmienna in
	[0-9]) #echo "1: $zmienna"
	skladak="000$zmienna.jpg"

	#!/bin/bash
	echo "program Projekt;" >> b.txt >> c.txt
	echo "begin" >> b.txt >> c.txt

	wyr1="^echo *" #echo
	wyr2="read *" #read

	#deklaracje_zmiennych
	wyr3="^[a-zA-Z0-9]*\=[0-9]" #deklaracja_integer
	wyr4="^[a-zA-Z0-9]*\=\"" #deklaracja_string

	#include <iostream>
	#include <math.h>
	class Trojkat{
	private:
	float x, y, z;//boki trojkata
	float obw2;//polowa obwodu trojkata
	float pole;//obwod trojkata

	public:
	Trojkat();

	#include <iostream>
	#include <windows.h>

	using namespace std;

	int main()
	{
	for (int i = 1;i <= 10;i++) {
	cout << i;
	Sleep(1000);

	#include <iostream>
	#include <time.h>
	#include <stdlib.h>
	using namespace std;
	int main()
	{
	cout << "Losowanie liczb: " << endl;


	//losowanie

	#include <iostream>
	using namespace std;

	int main()
	{
	int ile;
	cout << "Do ktorej liczby wyswietlic liczby parzyste: " << endl;
	cin >> ile;
	cout << "Liczby parzyste do liczby " << ile << endl;
	for (int i = 2; i <= ile;i++) {