Dell Vizioncore Guía de usuario descargar pdf (Pagina 61)

Managing Cartridges and Metrics 61

Using the Command Line for Administration Tasks

Groups

()

Parentheses are used to create capturing groups. A

capturing group in a text pattern is used to match sub-

strings in expressions. For example, in the construct

X(Y*)Z, the capturing group (Y*) matches both Y and

YY from the input, returning both XYZ and XYYZ as the

result of the expression.

Capturing groups can be nested and numbered using their

opening parentheses from left to right. For example, in

the construct

(X(Y))(Z)), the groups are numbered as

follows:

•

((X(Y))(Z)): group 1

•

(X(Y)): group 2

•

(Y): group 3

•

(Z): group 4

Following a series of capturing groups, it acts as a back

reference to match of the nth group.

For example, the expression ([a-d])X\1X\1 has only one

capturing group whose number is one ‘1’. It returns the

following matches:

• aXaXa

• bXbXb

• cXcXc

(?:N)

Indicates that N is a non-capturing group in a construct.

For example, in the construct

(X(?:Y))(Z), the group

(?:Y) is not considered as a capturing group. The groups

in the above construct are numbered as follows.

•

(X(?:Y))(Z): group 1

•

(X(?:Y)): group 2

•

(Z): group 3

For information about capturing groups and their syntax,

see “()” on page 61.

Syntax Description

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