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This article mainly introduces how to use grep in perl, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

The use of grep in perl

Grep is a list filtering function in perl, and the function is still good.

Grep can be expressed in two ways:

1. Grep BLOCK LIST

2. Grep EXPR, LIST

BLOCK represents a code block, usually {}; EXPR represents an expression, usually a regular expression. LIST is the list to match.

Example:

Count the number of list elements of matching expressions

$num = grep / ^ cds$/i,@array

$m=grep {$brray [$_] eq "" CDS "} @ brray

In a scalar context, grep returns the number of elements in a match; in a list context, grep returns a list of elements in a match.

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