Bootstrapify `the_posts_pagination()`

functions.php

<?php
/**
 * Update `the_posts_pagination()` markup for Bootstrap 4 styles
 *
 * Does this monstrosity work? Yes! Should you use it? Probably not.
 *
 * @param $markup string Original markup.
 * @return string Updated markup.
 */
function cameronjonesweb_bootstrapify_posts_pagination( $markup ) {
	$markup = str_replace( 'div class="nav-links"', 'ul class="pagination"', $markup );
	$markup = str_replace( '<a', '<li class="page-item"><a', $markup );
	$markup = str_replace( '</a></li>', '</a></li>', $markup );
	$markup = str_replace( '<span', '<li class="page-item disabled"><a', $markup );
	$markup = str_replace( '</span', '</a></span', $markup );
	$markup = str_replace( 'page-numbers', 'page-link', $markup );
	return $markup;
}

/* USAGE */
echo cameronjonesweb_bootstrapify_posts_pagination( get_the_posts_pagination( array( 'class' => '' ) ) );