H3C Technologies H3C S5120 Series Switches User Manual
Page 33
1-19
Character
Meaning
Remarks
[ ]
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
Repeats the character string
specified by the index. 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 repeats string, and thus a
matching string must contain stringstring.
(string1)(string2)\2 repeats string2, and thus a
matching string must contain string1string2string2.
(string1)(string2)\1\2 repeats string1 and string2
respectively, and thus a matching string must
contain 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.
\ Matches a character string starting For example, “\ string\> Matches a character string ending For example, “do\>” matches word “undo” and string \bcharacter2 Matches character1character2. For example, “\ba” matches “-a” with “-“ being \Bcharacter Matches a string containing For example, “\Bt” matches “t” in “install”, but not “t” character1\w Matches character1character2. For example, “v\w” matches “vlan”, with “v” being \W Equals \b. For example, “\Wa” matches “-a”, with “-” being \ Escape character. If a special For example, “\\” matches a string containing “\”, “\^”
with string.
with string.
“abcdo”.
character1 can be any character
except number, letter or underline,
and \b equals [^A-Za-z0-9_].
character1, and “a” being character2, but it does not
match “2a” or “ba”.
character, and no space is allowed
before character.
in “big top”.
character2 must be a number, letter,
or underline, and \w equals
[^A-Za-z0-9_].
character1, and “l” being character2. v\w also
matches “service”, with “i” being character2.
character1, and “a” being character2, but does not
match “2a” or “ba”.
character listed in this table follows \,
the specific meaning of the character
is removed.
matches a string containing “^”, and “\\b” matches a
string containing “\b”.