====== Mutt ======
Configuration file:
  ~/.muttrc

delete:
  [Shift + d]
  Delete messages matching:
    # delete all ~s: subject 
    ~s .* 
    # delete all emails matching the pattern in "from" field
    ~f pattern

  # purge
  $

move:
  s

flags:
  clear: W
  set: w
  select: 
    /
    ~F

show only match:
  l
  ~f pattern
show all:
  l
  all

http://www.mutt.org/doc/manual/

Example:
  l
    ~f pattern
    OR
    ~s pattern
  [Shift + Del]
  l
    all