get_url_in_content( string $content )

Extract and return the first URL from passed content.

Parameters

$content

(Required) A string which might contain a URL.

Return

(string|false) The found URL.

Source

File: wp-includes/formatting.php 

function get_url_in_content( $content ) {
	if ( empty( $content ) ) {
		return false;
	}

	if ( preg_match( '/<a\s[^>]*?href=([\'"])(.+?)\1/is', $content, $matches ) ) {
		return esc_url_raw( $matches[2] );
	}

	return false;
}

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Related

Changelog

Changelog
Version Description
WP-3.6.0 Introduced.