Huawei Quidway S2700 Series Configuration Manual page 32

Quidway S2700 Series Ethernet Switches
Configuration Guide - Basic Configuration
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Specifying a Filtering Mode in Command
The Quidway S2700 Series uses a regular expression to implement the filtering function of the
pipe character. A display command supports the pipe character only when there is excessive
output information.
When the output information is queried according to the filtering conditions, the first line of the
command output starts with the information containing the regular expression.
The command can carry the parameter | count to display the number of matching entries. The
parameter | count can be used together with other parameters.
For the commands supporting regular expressions, the three filtering methods are as follows:
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Issue 01 (2011-07-15)
NOTE
Unless otherwise specified, all characters in the preceding table are displayed on the screen.
Degeneration of particular characters
Certain particular characters, when being placed at the following positions in the regular
expression, degenerate to common characters.
– The particular characters following "\" is transferred to match particular characters
themselves.
– The particular characters "*", "+", and "?" placed at the starting position of the regular
expression. For example, +45 matches "+45" and abc(*def) matches "abc*def".
– The particular character "^" placed at any position except for the start of the regular
expression. For example, abc^ matches "abc^".
– The particular character "$" placed at any position except for the end of the regular
expression. For example, 12$2 matches "12$2".
– The right bracket such as ")" or "]" being not paired with its corresponding left bracket
"(" or "[". For example, abc) matches "abc)" and 0-9] matches "0-9]".
NOTE
Unless otherwise specified, degeneration rules are applicable when preceding regular expressions
serve as subexpressions within parentheses.
Combination of common and particular characters
In actual application, a regular expression combines multiple common and particular
characters to match certain strings.
CAUTION
| begin regular-expression: displays the information that begins with the line that matches
regular expression.
| exclude regular-expression: displays the information that excludes the lines that match
regular expression.
| include regular-expression: displays the information that includes the lines that match
regular expression.
NOTE
The value of regular-expression is a string of 1 to 255 characters.
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