some example use cases for using filters with IssueM Issue-to-PDF

issuem-pdf-filters.php

<?php

add_filter( 'issuem_pdf_toc_title', 'zeen101_toc_title' );
function zeen101_toc_title( $toc ) {
	return 'List of Articles';
}

add_filter( 'issuem_pdf_styles', 'zeen101_pdf_styles' );
function zeen101_pdf_styles( $styles ) {
	$new_styles = 'h2 { color: red; }';
	return $styles . $new_styles;
}

add_filter( 'issuem_pdf_html', 'zeen101_new_pdf_html', 10, 3 );
function zeen101_new_pdf_html( $results, $term, $issue_id ) {
	return '<h2>Some new html</h2>' . $results;
}

Hi,
I'd love to use issuem_pdf_html to strip out some shortcode that's appearing in my PDFs, and also to hide the author and issue title from appearing at the top of each article.

Example is here: http://prettycool.site/example.pdf

Specifically I'm asking for help with how to properly write "anywhere you see the '[' character, ignore it and everything after it until you see the ']' character."

Thank you.