Регулярное выражение для времени.

[ocehb]

типа hh:mm:

(?:[01]?[0-9]|2[0-4]):[0-5][0-9]

  DB<3> p "02:00" =~ m#(?:[01]?[0-9]|2[0-4]):[0-5][0-9]#
1
  DB<4> p "02:61" =~ m#(?:[01]?[0-9]|2[0-4]):[0-5][0-9]#

  DB<5> p "02:61" =~ m#(?:[01]?[0-9]|2[0-4]):[0-5][0-9]#

  DB<6> p "02:59" =~ m#(?:[01]?[0-9]|2[0-4]):[0-5][0-9]#
1
  DB<7> p "2:59" =~ m#(?:[01]?[0-9]|2[0-4]):[0-5][0-9]#
1
  DB<8> p "12:59" =~ m#(?:[01]?[0-9]|2[0-4]):[0-5][0-9]#
1
  DB<9> p "22:59" =~ m#(?:[01]?[0-9]|2[0-4]):[0-5][0-9]#
1