Unescaped left brace in regex is illegal here in regex; marked by <-- HERE in m/
          ^(.*?)              # $1 - start of line up to directive
            (?:
              {{ <-- HERE           # start of tag
              (.*?)           # $2 - tag contents
              }}            # end of tag
            )
        / at /home/phaidev/work/perl5/lib/5.26.1/x86_64-linux/Template/Parser.pm line 299.