H3C Technologies H3C SecPath F1000-E - Manual (Page 219)

5
Character Meaning Remarks
_
If it is at the beginning or the end of
a regular expression, it equals ^ or
$. In other cases, it equals comma,
space, round bracket, or curly
bracket.
For example, “a_b” matches “a b” or “a(b”; “_ab”
only matches a line starting with “ab”; “ab_” only
matches a line ending with “ab”.
-
It connects two values (the smaller
one before it and the bigger one
after it) to indicate a range together
with [ ].
For example, “1-9” means 1 to 9 (inclusive); “a-h”
means a to h (inclusive).
[ ]
Matches a single character
contained within the brackets.
For example, [16A] matches a string containing
any character among 1, 6, and A; [1-36A]
matches a string containing any character among
1, 2, 3, 6, and A (- is a hyphen).
“]” can be matched as a common character only
when it is put at the beginning of characters within
the brackets, for example [ ]string]. There is no
such limit on “[”.
( )
A character group. It is usually used
with “+” or “*”.
For example, (123A) means a character group
“123A”; “408(12)+” matches 40812 or
408121212. But it does not match 408.
\index
Matches the character string
specified by the index twice. A
character string refers to the string
within () before \. index refers to the
sequence number (starting from 1
from left to right) of the character
group before \. If only one
character group appears before \,
index can only be 1; if n character
groups appear before index, index
can be any integer from 1 to n.
For example, (string)\1 matches string twice, and
thus matches a string containing stringstring.
(string1)(string2)\2 matches string2 twice, and
thus matches a string containing
string1string2string2. (string1)(string2)\1\2
matches string1string2 twice, and thus matches a
string containing string1string2string1string2.
[^]
Matches a single character not
contained within the brackets.
For example, [^16A] means to match a string
containing any character except 1, 6 or A, and the
matching string can also contain 1, 6 or A, but
cannot contain these three characters only. For
example, [^16A] matches “abc” and “m16”, but
not 1, 16, or 16A.
\<string
Matches a character string starting
with string. For example, “\<do” matches word “domain” and
string “doa”.
string\>
Matches a character string ending
with string. For example, “do\>” matches word “undo” and
string “abcdo”.
\bcharacter2
Matches character1character2.
character1 can be any character
except number, letter or underline,
and \b equals [^A-Za-z0-9_].
For example, “\ba” matches “-a” with “-“ being
character1, and “a” being character2, but it does
not match “2a” or “ba”.
\Bcharacter
atches a string containing
character, and no space is allowed
before character.
For example, “\Bt” matches “t” in “install”, but not
“t” in “big top”.