in reply to
How to extract an email address from a mailto URL?
If you want to differentiate between addresses in anchor tags and other uses of "mailto:" in the file, read the entire file into memory and use the match operator (m//). As suggested previously, you should use Regexp::Common::Email::Address to help compose a regular expression for the email address and enclosing HTML. I would use "\s+" between the "a" and "href" and "\s*" adjacent to the equal sign to match HTML's treatment of whitespace. Note that HTML allows quoting with both single and double quotes. Also, older HTML allowed you to not quote the information after the equal sign in some circumstances.