what is "Quantifier follows nothing before HERE mark in regex m/* << HERE / "?

bhavanirayala

Hi All,

I am getting the following warning while running the perl script

Warning is:

Quantifier follows nothing before HERE mark in regex m/* << HERE /

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foreach(keys %hash) 

{
 
    if($_ =~ /$arr[0]/)    // Here I am getting the above warning

    {

         $team = $hash{$myKeys[0]};
 
     }

    else

    {

       $team = $hash{$myKeys[1]};

   }

last;

}

I am comparing the arr[0] with the first key.Why I am getting this?
can anybody help me?

Regards,
Bhavani

KevinADC

$arr[0] has an asterisk at the beginning which is interpreted as a quantifier inside of a regexp. Use \Q...\E to escape meta characters in the string:

if ($_ =~ /\Q$arr[0]\E/)

see if that helps.

bhavanirayala

Thankyou Kevin.
now It is working fine.

what is "Quantifier follows nothing before HERE mark in regex m/* << HERE / "?

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