ofermod finds
all words with the sequence of letters "ofermod"
in them.
g(.{1,3})ld finds words containing the letters g and ld
with a minimum of one and
a maximum of three other letters intervening. For example, it finds "geld", "gield",
and "gyld". Note the curly braces. One reads the
expression as, G followed by a single character and a minimum of one and a maximum of three
characters before a lower-case l and d.
ode\b finds words ending with the letters ode. It finds "mode", "gode",
and "werode"