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Tutorial for a Regex Matching a URL

A regular expression, or regex, is a sequence of characters that defines a search pattern that can be used to validate user input. This tutorial breaks down a regex used for matching a URL.

Summary

The following regex can be used to validate a URL and has been broken down in this tutorial by its components (anchor, quantifies, grouping constructs, bracket expressions, character classes, and character escapes). Each section describes the symbol, a description, and where the code is found within the regex.

Regex Matching a URL:

dazecoop

<?php


/**
 * List available attributes on product page in a drop-down selection
 */
add_action('woocommerce_before_add_to_cart_button', 'list_attributes_on_product_page');
function list_attributes_on_product_page() {
    global $product;
    $attributes = $product->get_attributes();

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intitle:index.of .bash_history
intitle:index.of .sh_history
intitle:"Index of" index.html.bak
intitle:"Index of" index.php.bak
intitle:"Index of" index.jsp.bak
intitle:"Index of" ".htpasswd" htpasswd.bak
inurl:backup intitle:index.of inurl:admin
"Index of /backup"
intitle:"Index of" index.html~
intitle:"Index of" index.php~