perl string extract

anu_1 has asked for the wisdom of the Perl Monks concerning the following question:

I have to extract the filename

$line="logfile = filename   ,  abcd=eflk , cxd";

$line=~/logfile\s*=\s*(.*?),/$1/;

$file=$1;
[download]

But it will not work if the line is "logfile= filename", Is there any way for this particular case to specify there could be zero or one occurrence of comma. Thanks for your help

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