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   1  <?php
   2  
   3  declare(strict_types=1);
   4  
   5  namespace GuzzleHttp\Psr7;
   6  
   7  /**
   8   * @internal
   9   */
  10  final class Rfc7230
  11  {
  12      /**
  13       * Header related regular expressions (based on amphp/http package)
  14       *
  15       * Note: header delimiter (\r\n) is modified to \r?\n to accept line feed only delimiters for BC reasons.
  16       *
  17       * @link    https://github.com/amphp/http/blob/v1.0.1/src/Rfc7230.php#L12-L15
  18       *
  19       * @license https://github.com/amphp/http/blob/v1.0.1/LICENSE
  20       */
  21      public const HEADER_REGEX = "(^([^()<>@,;:\\\"/[\]?={}\x01-\x20\x7F]++):[ \t]*+((?:[ \t]*+[\x21-\x7E\x80-\xFF]++)*+)[ \t]*+\r?\n)m";
  22      public const HEADER_FOLD_REGEX = "(\r?\n[ \t]++)";
  23  }