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Shortcut Expansion Description
[[:alpha:]] [a-zA-Z] An alphabetic character.
[[:alnum:]] [0-9A-Za-z] An alphabetic or numeric character.
[[:digit:]] \d A digit, 0-9.
[[:lower:]] [a-z] A lower case letter.
[[:upper:]] [A-Z] An upper case letter.
[[:punct:]] [!"#$%&'()*+,-./:;<=>?@\[\\\]^_`{|}~] A punctuation character – note the escaped characters [, \, and ].
/bea?t/ Matches either 'beat' or 'bet'
/bea+t/ Matches 'beat', 'beaat', 'beaaat'…
/bea*t/ Matches 'bet', 'beat', 'beaat'…
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