# wordpress-seo/19.0/vendor_prefixed/guzzlehttp/psr7/src/Rfc7230.php

Yoast SEO – Advanced SEO with real-time guidance and built-in AI, version 19.0. 20 lines.

- Page: https://pluginprobe.com/plugins/wordpress-seo/19.0/code/vendor_prefixed/guzzlehttp/psr7/src/Rfc7230.php
- Raw: https://pluginprobe.com/plugins/wordpress-seo/19.0/raw/vendor_prefixed/guzzlehttp/psr7/src/Rfc7230.php
- Modified: 2022-01-11T10:18:10+00:00

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```php
<?php

namespace YoastSEO_Vendor\GuzzleHttp\Psr7;

final class Rfc7230
{
    /**
     * Header related regular expressions (copied from amphp/http package)
     * (Note: once we require PHP 7.x we could just depend on the upstream package)
     *
     * Note: header delimiter (\r\n) is modified to \r?\n to accept line feed only delimiters for BC reasons.
     *
     * @link    https://github.com/amphp/http/blob/v1.0.1/src/Rfc7230.php#L12-L15
     *
     * @license https://github.com/amphp/http/blob/v1.0.1/LICENSE
     */
    const HEADER_REGEX = "(^([^()<>@,;:\\\"/[\\]?={}\1- ]++):[ \t]*+((?:[ \t]*+[!-~€-ÿ]++)*+)[ \t]*+\r?\n)m";
    const HEADER_FOLD_REGEX = "(\r?\n[ \t]++)";
}

```