Huawei netengine80e Configuration Manual page 32

HUAWEI NetEngine80E/40E Router
Configuration Guide - Basic Configurations
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Issue 02 (2011-09-10)
Particul Syntax
ar
characte
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_ Matches a comma "," left brace "{",
right brace "}", left parenthesis "(",
and right parenthesis ")".
Matches the starting position of the
input string.
Matches the ending position of the
input string.
Matches a space.
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.
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2 CLI Overview
Example
_2008_ matches "2008", "space
2008 space", "space 2008", "2008
space", ",2008,", "{2008}",
"(2008)", "{2008", and "(2008}".
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