Parsing all WordPress post and page text, link all @ and # words to Instgram tags and profiles

listing-18-4.php

function wh_add_social_links( $content ) {
	$content = preg_replace( '/([^a-zA-Z0-9-_&])@([0-9a-zA-Z_]+)/', "$1<a href=\"https://www.instagram.com/$2/\" target=\"_blank\">@$2</a>", $content );
	$content = preg_replace( '/([^a-zA-Z0-9-_&])#([0-9a-zA-Z_]+)/', "$1<a href=\"https://www.instagram.com/explore/tags/$2/\" target=\"_blank\">#$2</a>", $content );
	return $content;
}
add_filter( 'the_content', 'wh_add_social_links' );
add_filter( 'comment_text', 'wh_add_social_links' );