foo # The string "foo"
^foo # "foo" at the start of a string
foo$ # "foo" at the end of a string
^foo$ # "foo" when it is alone on a string
[abc] # a, b, or c
[a-z] # Any lowercase letter
[^A-Z] # Any character that is not a uppercase letter
(gif|jpg) # Matches either "gif" or "jpeg"
[a-z]+ # One or more lowercase letters
[0-9\.\-] # Аny number, dot, or minus sign
^[a-zA-Z0-9_]{1,}$ # Any word of at least one letter, number or _
([wx])([yz]) # wy, wz, xy, or xz
[^A-Za-z0-9] # Any symbol (not a number or a letter)
([A-Z]{3}|[0-9]{4}) # Matches three letters or four numbers
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