Perl qr Function

Description

This function quotes its STRING as a regular expression. STRING is interpolated the same way as PATTERN in m/PATTERN/

Syntax

Following is the simple syntax for this function −

qr EXPR

Return Value

This function returns a Perl value which may be used instead of the corresponding /STRING/ expression.

Example

Following is the example code showing its basic usage −

$rex = qr/my.STRING/is;
s/$rex/foo/;

is is equivalent to

s/my.STRING/foo/is;

When above code is executed, it produces the following result −

$re = qr/$pattern/;
$string =~ /foo${re}bar/;	# can be interpolated in other patterns
$string =~ $re;			# or used standalone
$string =~ /$re/;		# or this way