Core Function Grep

Revision as of 18:39, 22 April 2012

Grep( <pattern>, <array>, <flag> )

Description

Returns a new array consisting of the elements of the input array that match the given regex pattern.

Parameters

pattern

A regular expression pattern to use.

array

The array to use.

flag

Optional; If the flag is higher than 0 the search will be inverted and everything that does not match will be returned instead of everything that does match. (Default is 0)

Return Value

Success - Returns 1.

Failure - Returns 0.

Remarks

This also includes Hash values with the array values.

Example

Return everything that matches

my $array = array( "Test123", "moo", "cat", "dog555", "meows"  );
my $lol = Grep( m/\d+/, $array );
foreach($lol as $c)
{
	println("Value: $c");
}

Return everything that does not match (by setting the flag to 1)

my $array = array( "Test123", "moo", "cat", "dog555", "meows"  );
my $lol = Grep( m/\d+/, $array, 1 );
foreach($lol as $c)
{
	println("Value: $c");
}

In this example it returns all KEYS that match in the Hash(Dictionary) instead of the values

my $array = array( "One" => "Cat", "Two222" => "Fire", "Three" => "FoX", "Four444" => "Water" );
my $lol = GrepKeys( m/\d+/, $array );
foreach($lol as $key <=> $value)
{
	println("$key <=> $value");
}
 
Function GrepKeys( $pattern, $input, $flags = 0 )
{
	my $keys = Grep( $pattern, Keys($input), $flags );
	my $vals = array();
	foreach ( $keys as $key )
	{
		$vals[$key] = $input[$key];
	}
	return $vals;
}