Replace any list of a's by x:

Replace any list of f's with one argument:

a.. represents a sequence of a's inside any head:

Replace any list of a's with length up to 3:

Replace any list of a's with lengths between 2 and 3:

Replace lists of length exactly 3 elements:

Replace lists with lengths between 0 and 2 elements:

Replace lists with 0 to 3 identical elements:

Require only part of the pattern to be the same throughout the sequence:

Define a function that takes as an argument any list of pairs:

Repeated[p] or p.. is equivalent to Repeated[p,{1,Infinity}]:

Repeated[p,max] is equivalent to Repeated[p,{1,max}]:

Repeated[p] and Repeated[p,max] require at least one repeat:

RepeatedNull[p] and RepeatedNull[p,max] allow zero repeats:

The forms RepeatedNull[p,{min,max}] and Repeated[p,{min,max}] are equivalent:

So are the forms RepeatedNull[p,{n}] and Repeated[p,{n}]:

Use parentheses or spaces to indicate that 1.. is not 1. followed by a dot:

A repeated named pattern will only match a sequence of identical repeats:

A repeated unnamed pattern can match a sequence of nonidentical elements: