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