The mistake you have done is you have not stored the current line in variable $x. Also \w+ will match only 'note_values' and not the remaining string 'note_values,notes_values2
' as it contains ',' in between.
The below code will meet your requirement. Also refer perlre to learn how to store the matched value in variables.
while($x=<DATA>){
if ($x =~ /^\[Note\](.+)$/){
$var = $1; #store in a variable
print $var;
}
}
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