HP 4800G Series Configuration Manual page 1702

Character
A character group. It is usually used with
( )
"+" or "*".
Repeats a specified character group for
once. A character group refers to the
string in () before \. index refers to the
sequence number (starting from 1 from
left to right) of the character group before
\index
\: if only one character group appears
before \, then index can only be 1; if n
character groups appear before index,
then index can be any integer from 1 to n.
Used to match any character not in a
[^]
specified range.
Used to match a character string starting
\<string
with string.
Used to match a character string ending
string\>
with string.
Used to match character1character2.
character1 can be any character except
\bcharacter2
number, letter or underline, and \b equals
[^A-Za-z0-9_].
It must match a string containing
\Bcharacter character, and there can no spaces
before character.
Used to match character1character2.
character2 must be a number, letter or
character1\w
underline, and \w equals [^A-Za-z0-9_].
\W Equals \b.
Escape character. If single special
characters listed in this table follow \, the
\
specific meanings of the characters will
be removed.
Multiple-screen output
When there is a lot of information to be output, the system displays the information in multiple screens.
Generally, 24 lines are displayed on one screen, and you can also use the screen-length command to
set the number of lines displayed on the next screen. (For the details of this command, refer to Login
Meaning
1-19
Remarks
For example, (123A) means a character
group "123A"; "408(12)+" can match
40812 or 408121212. But it cannot
match 408.
For example, (string)\1 means to repeat
string for once, and (string)\1 must
match a string containing stringstring;
(string1)(string2)\2 means to repeat
string2 for once, and (string1)(string2)\2
must match a string containing
string1string2string2;
(string1)(string2)\1\2 means to repeat
string1 for once first, and then repeat
string2 for once, and
(string1)(string2)\1\2 must match a string
containing string1string2string1string2.
For example, [^16A] means to match a
string containing any character except 1,
6 or A, and the string can also contain 1,
6 or A, but cannot contain these three
characters only. For example, [^16A]
can match "abc" and "m16", but not 1,
16, or 16A.
For example, "\<do" can match word
"domain" or string "doa".
For example, "do\>" can match word
"undo" or string "abcdo".
For example, \ba can match -a, with -
represents character1, and a represents
character2; while \ba cannot match "2a"
or "ba".
For example, "\Bt" can match "t" in
"install", but not "t" in "big top".
For example, "v\w" can match "vlan",
with "v" being character1, and "l" being
character2. v\w can also match
"service", with "i" being character2.
For example, "\Wa" can match "-a", with
"-" representing character1, and "a"
representing character2; while "\ba"
cannot match "2a" or "ba".
For example, "\\" can match a string
containing "\", "\^" can match a string
containing "^", and "\\b" can match a
string containing "\b".