Cisco Systems 6500 manual Parentheses for Recall, 1300, a.bc.\1\2, 1-11

Chapter 1 Command-Line Interface

Using the CLI String Search

For example,

_1300_

matches any string that has 1300 somewhere in the string. The string’s 1300 can be preceded by or end with a space, brace, comma, or underscore. For example,

{1300_

matches the regular expression, but 21300 and 13000 do not.

Using the underscore character, you can replace long regular expression lists, such as the following:

^1300$ ^1300(space) (space)1300 {1300, ,1300, {1300} ,1300, (1300

with

_1300_

Parentheses for Recall

As shown in the “Multipliers” section on page 1-9, you use parentheses with multiple-character regular expressions to multiply the occurrence of a pattern. You can also use parentheses around a single- or multiple-character pattern to remember a pattern for use elsewhere in the regular expression.

To create a regular expression that recalls a previous pattern, you use parentheses to indicate a remembered specific pattern and a backslash (\) followed by an integer to reuse the remembered pattern. The integer specifies the occurrence of the parentheses in the regular expression pattern. If you have more than one remembered pattern in your regular expression, then \1 indicates the first remembered pattern, \2 indicates the second remembered pattern, and so on.

This regular expression uses parentheses for recall:

a(.)bc(.)\1\2

This regular expression matches an a followed by any character (call it character 1), followed by bc, followed by any character (character 2), followed by character 1 again, and then followed by character 2 again. The regular expression can match aZbcTZT. The software remembers that character 1 is Z and character 2 is T and then uses Z and T again later in the regular expression.

Catalyst 6500 Series Switch SSL Services Module Command Reference

OL-9105-01 1-11