Brocade Communications Systems NetIron CER Series Installation Guide download pdf (Page 70)

whois WHOIS lookup

write Write running configuration to flash or terminal

As with the commands for filtering output from show commands, the search string is a regular

expression consisting of a single character or string of characters. You can use special characters to

construct complex regular expressions. See the next section for information on special characters

used with regular expressions.

Using special characters in regular expressions

You use a regular expression to specify a single character or multiple characters as a search string. In

addition, you can include special characters that influence the way the software matches the output

against the search string. These special characters are listed in the following table.

Special characters for regular expressions TABLE 12

Character Operation

. The period matches on any single character, including a blank space.

For example, the following regular expression matches "aaz", "abz", "acz", and so on, but not just

"az":

a.z

* The asterisk matches on zero or more sequential instances of a pattern.

For example, the following regular expression matches output that contains the string "abc", followed

by zero or more Xs:

abcX*

+ The plus sign matches on one or more sequential instances of a pattern.

For example, the following regular expression matches output that contains "de", followed by a

sequence of "g"s, such as "deg", "degg", "deggg", and so on:

deg+

? The question mark matches on zero occurrences or one occurrence of a pattern.

For example, the following regular expression matches output that contains "dg" or "deg":

de?g

NOTE

Normally when you type a question mark, the CLI lists the commands or options at that CLI level that

begin with the character or string you entered. However, if you enter Ctrl-V and then type a question

mark, the question mark is inserted into the command line, allowing you to use it as part of a regular

expression.

^ A caret (when not used within brackets) matches on the beginning of an input string.

For example, the following regular expression matches output that begins with "deg":

^deg

$ A dollar sign matches on the end of an input string.

For example, the following regular expression matches output that ends with "deg":

deg$

Using special characters in regular expressions

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Brocade Communications Systems NetIron CER Series Installation Guide Page 70