Image case-sensitivity

I had a multiple imports fail due to case-sensitivity. (IMG SRC, IMG src, etc).

Here are updated preg_match_all() which are case-insensitive:

Line 139:
preg_match_all(‘/<a[^>]* href=[\'”]?([^>\'” ]+)/i’, $content, $matches);

Line 771:
preg_match_all(‘/<img[^>]* src=[\'”]?([^>\'” ]+)/i’, $post->post_content, $matches);

Line 778:
preg_match_all(‘/<img[^>]* src=[\'”]?([^>\'” ]+)/i’, $custom, $matches);

Line 851:
preg_match_all(‘/<a[^>]* href=[\'”]?([^>\'” ]+)/i’, $content, $matches);

https://ww.wp.xz.cn/plugins/import-html-pages/