my $regex = qr/ \A [^,]+ \Z /x;
...
my $flag  = 1 if $var =~ /\G ($regex) /gcx;

Because  qr/ \A [^,]+ \Z /x matches an entire string, the  /g regex modifier has no meaning (and it's also used in a boolean context). Likewise the  /c modifier. Likewise the  \G anchor. Likewise the capture group around the  $regex regex object, although in the original code a capture may be pertinent. 

>perl -wMstrict -le
"my $rx = qr/ \A [^,]* \z /x;
 ;;
 for my $s (',abcd', 'abc,d', 'abcd,', ',,,', 'abcd', '.;$%&', '') {
   print qq{'$s' }, $s =~ $rx ? '' : 'NO', ' match';
   }
"
',abcd' NO match
'abc,d' NO match
'abcd,' NO match
',,,' NO match
'abcd'  match
'.;$%&'  match
''  match

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In reply to Re^2: Regex to capture every readable character except COMMA by AnomalousMonk
in thread Regex to capture every readable character except COMMA by nehavin

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