Wildcards in Word

I know little of wildcard usage in word.

wildcards - case sensitive

TO FIND

enter mark                       ^13
tab                              ^t
any lowercase letter             [a-z]
any uppercase letter             [A-Z]
any letter                       [A-z]
any digit                        [0-9]
any no. between 6–9              [6-9]
any letter between d–k           [d-k]
any word contains only letters   ([A-z]@>)
any word contains only digits    ([0-9]@>)
for grouping (for replace)       (   )
any character(s) between ...     (*)
any para                         ^13(*)^13

TO REPLACE

To replace first group   \1
To replace second group  \2
enter mark               ^p
tab                      ^t

I want to know more about this. Can anyone help me?