Agreed -- looking at the player data[1], IMO the format type is unrecognizable:

  ## GK / Goalkeepers

  Kawashima|Eiji Kawashima,   20 Mar 1983
  Nishikawa|Shusaku Nishikawa,   18 Jun 1986
  Gonda|Shūichi Gonda,   3 Mar 1989

  ## DF / Defenders

  Inoha|Masahiko Inoha,   28 Aug 1985
  G. Sakai|Gōtoku Sakai,   14 Mar 1991
  Nagatomo|Yuto Nagatomo,   12 Sep 1986
  Uchida|Atsuto Uchida,   27 Mar 1988
  Konno|Yasuyuki Konno,   25 Jan 1983
  Kurihara|Yuzo Kurihara,   18 Sep 1983
  H. Sakai|Hiroki Sakai,   12 Apr 1990
  Yoshida|Maya Yoshida,   24 Aug 1988
  Masato Morishige,      21 May 1987   ## Japan F.C. Tokyo

Comments as a double-hash, key fields are either player last name or occasionally first initial-space-last name, then three different delimiters of pipe, then comma, then tab. Choosing either a consistently delimited format or a more verbose JSON/YAML structure with clear metadata would seem to be a better approach.

[1] https://github.com/openfootball/players/blob/master/asia/jp-...