"(" and ")" are treated literally when inside [], no need to escape them.
LoaderUtil::parseFeed():
- format the code on multiple lines for easier readability.
- restore the regex (line 69) to that from commit dda15b0aaddec01, basically replacing "(?)" in the pattern with (?:HREF). For more details see the discussion in the diff review.
htmlToPlainText(): make the regex pattern non-greedy otherwise it may
match the whole subject string.