note 56519 deleted from reference.pcre.pattern.syntax by colder

Note Submitter: Andrew ---- wfinn, your example falls into one of the common traps, which is trying to parse a complicated language with a simple regex. Just try feeding it input containing a tag like <img class="match1" alt="<">. It'll die a horrible death. The main lesson here is "never parse HTML with a regex". The lesson for the advanced reader is "never use a regex where a parser is called for."