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<?php
declare(strict_types=1);
/*
 * This file is part of the league/commonmark package.
 *
 * (c) Colin O'Dell <colinodell@gmail.com>
 *
 * Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
 *  - (c) John MacFarlane
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace League\CommonMark\Util;
use League\CommonMark\Exception\InvalidArgumentException;
use League\CommonMark\Extension\CommonMark\Node\Block\HtmlBlock;
/**
 * Provides regular expressions and utilities for parsing Markdown
 *
 * All of the PARTIAL_ regex constants assume that they'll be used in case-insensitive searches
 * All other complete regexes provided by this class (either via constants or methods) will have case-insensitivity enabled.
 *
 * @phpcs:disable Generic.Strings.UnnecessaryStringConcat.Found
 *
 * @psalm-immutable
 */
final class RegexHelper
{
    // Partial regular expressions (wrap with `/` on each side and add the case-insensitive `i` flag before use)
    public const PARTIAL_ENTITY                = '&(?:#x[a-f0-9]{1,6}|#[0-9]{1,7}|[a-z][a-z0-9]{1,31});';
    public const PARTIAL_ESCAPABLE             = '[!"#$%&\'()*+,.\/:;<=>?@[\\\\\]^_`{|}~-]';
    public const PARTIAL_ESCAPED_CHAR          = '\\\\' . self::PARTIAL_ESCAPABLE;
    public const PARTIAL_IN_DOUBLE_QUOTES      = '"(' . self::PARTIAL_ESCAPED_CHAR . '|[^"\x00])*"';
    public const PARTIAL_IN_SINGLE_QUOTES      = '\'(' . self::PARTIAL_ESCAPED_CHAR . '|[^\'\x00])*\'';
    public const PARTIAL_IN_PARENS             = '\\((' . self::PARTIAL_ESCAPED_CHAR . '|[^)\x00])*\\)';
    public const PARTIAL_REG_CHAR              = '[^\\\\()\x00-\x20]';
    public const PARTIAL_IN_PARENS_NOSP        = '\((' . self::PARTIAL_REG_CHAR . '|' . self::PARTIAL_ESCAPED_CHAR . '|\\\\)*\)';
    public const PARTIAL_TAGNAME               = '[a-z][a-z0-9-]*';
    public const PARTIAL_BLOCKTAGNAME          = '(?:address|article|aside|base|basefont|blockquote|body|caption|center|col|colgroup|dd|details|dialog|dir|div|dl|dt|fieldset|figcaption|figure|footer|form|frame|frameset|h1|head|header|hr|html|iframe|legend|li|link|main|menu|menuitem|nav|noframes|ol|optgroup|option|p|param|section|source|summary|table|tbody|td|tfoot|th|thead|title|tr|track|ul)';
    public const PARTIAL_ATTRIBUTENAME         = '[a-z_:][a-z0-9:._-]*';
 
 
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