Pipy Proxy

A proxy server spoofs the IP address, port, and hardware information. It can also act as a secure gateway for data transmission in an already encrypted form (for example, this is how a proxy with the SOCKS5 protocol works).

In Perl, regular expressions (regex) are a powerful tool for parsing and manipulating text. Below is a basic example of using Perl regex to parse text. Please note that the regex patterns and the parsing logic depend on the specific structure of your text data.

Let's assume you have a simple text string with information about people, and you want to extract names and ages. Here's an example:

use strict;
use warnings;

my $text = "John Doe, age 30; Jane Smith, age 25; Bob Johnson, age 40";

# Define a regex pattern to match names and ages
my $pattern = qr/(\w+\s+\w+),\s+age\s+(\d+)/;

# Use the regex pattern to extract information
while ($text =~ /$pattern/g) {
    my $name = $1;
    my $age = $2;
    print "Name: $name, Age: $age\n";
}

In this example:

• The text contains information about people, where each entry is separated by a semicolon.

• The regex pattern (\w+\s+\w+),\s+age\s+(\d+) is used to match names and ages. Breaking down the pattern:

  • (\w+\s+\w+): Matches names consisting of one or more word characters (letters, digits, underscores) separated by whitespace.
  • ,: Matches the comma separating the name and age.
  • \s+age\s+: Matches the string "age" surrounded by whitespace.
  • (\d+): Matches one or more digits representing the age.

• The while ($text =~ /$pattern/g) loop iterates through matches found in the text.

• Inside the loop, $1 and $2 capture the matched name and age, respectively.

To scrape an image using Selenium in C#, you can find the image element on the web page and then retrieve the image source (URL) or download the image file. Here's a simple example:

using System;
using OpenQA.Selenium;
using OpenQA.Selenium.Chrome;

class Program
{
    static void Main()
    {
        // Set up the Chrome WebDriver
        using (var driver = new ChromeDriver())
        {
            // Navigate to the web page containing the image
            driver.Navigate().GoToUrl("https://example.com");

            // Find the image element (replace with your actual locator)
            IWebElement imageElement = driver.FindElement(By.XPath("//img[@id='your_image_id']"));

            // Get the source URL of the image
            string imageUrl = imageElement.GetAttribute("src");

            Console.WriteLine("Image Source URL: " + imageUrl);

            // Download the image (optional)
            DownloadImage(imageUrl);
        }
    }

    // Function to download the image
    static void DownloadImage(string imageUrl)
    {
        using (var webClient = new System.Net.WebClient())
        {
            // Replace "downloaded_image.jpg" with your desired file name
            webClient.DownloadFile(imageUrl, "downloaded_image.jpg");
            Console.WriteLine("Image Downloaded Successfully.");
        }
    }
}

In this example:

The Chrome WebDriver is set up.

The program navigates to a web page (replace "https://example.com" with the actual URL).

The image element is located using a locator (replace "//img[@id='your_image_id']" with the actual XPath or other locator for your image).

The source URL of the image is retrieved using GetAttribute("src").

Optionally, the DownloadImage function is called to download the image using WebClient. Adjust the file name and path as needed.

Explicit and implicit waiting are two types of waiting strategies used in Selenium WebDriver to handle synchronization issues in web applications. They help in dealing with elements that are not immediately available on the page when the test starts.

Explicit Wait:

Explicit wait is used when you know exactly which element you are waiting for and how long you want to wait for that element to be available. It uses the WebDriverWait class to wait for a specified condition to be true for a specified amount of time. Explicit wait is more reliable and is generally recommended when you know the expected conditions.

The main components of explicit wait are:

- WebDriverWait: It is a class that provides a way to wait for a condition to be true for a specified amount of time.

- ExpectedConditions: It is a class that provides a way to specify the condition to be true.

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

driver = webdriver.Chrome()
driver.get("http://example.com")

# Explicit wait for an element to be present
wait = WebDriverWait(driver, 10)
element = wait.until(EC.presence_of_element_located((By.ID, "myElement")))

Implicit Wait:

Implicit wait is a global setting that applies to all find_element and find_elements calls in a test. It tells the WebDriver to wait for a specified amount of time for an element to be available before throwing a NoSuchElementException. Implicit wait is less reliable than explicit wait because it applies to all elements in the test, not just the specific one you are waiting for.

The main components of implicit wait are:

ImplicitlyWait: It is a method used to set the amount of time the WebDriver should wait for an element to be available before throwing a NoSuchElementException.

from selenium import webdriver
from selenium.common.exceptions import NoSuchElementException

driver = webdriver.Chrome()
driver.implicitly_wait(10) # Set implicit wait to 10 seconds
driver.get("http://example.com")

try:
    element = driver.find_element(By.ID, "myElement")
except NoSuchElementException:
    print("Element not found")

In summary, the main difference between explicit and implicit waiting in Selenium is that explicit wait is used for waiting for a specific condition to be true for a specified amount of time, while implicit wait is a global setting that applies to all find_element and find_elements calls in a test. Explicit wait is more reliable and is generally recommended for specific scenarios, while implicit wait is less reliable but simpler to use for general cases.

To check a proxy for blacklisting, it is necessary to use special tools developed for this purpose. Many proxy-checkers provide free online IP-address verification and provide detailed information related to the proxy servers security. To get it, just enter the IP address of the proxy and click on the "Verify" button.