[w([one]|[two]|[three]|[four])]

##</code><code>##

[w(one bracket \)|two brackets \))]

##</code><code>##

[w(one of these ")"|one of these "]")]

##</code><code>##

($_='kkvvttuubbooppuuiiffssqqffssmmiibbddllffss')
 =~y~b-v~a-z~s;                             print