check (e.g. grep) for lines, which contain 'mailto:' (be more specific if you like to; match the 'href' ...);
use Regexp::Common together with Regexp::Common::Email::Address to identify the mail address in matching lines

PS: Don't remove your original question here.

update

  1. RCEA added

In reply to Re: How to extract an email address from a mailto URL? by linuxer
in thread How to extract an email address from a mailto URL? by jdlev

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