c# - Year not displaying correctly with regex -

using regex match line of text have discovered year still appearing 2015-01-07 , not 2015. can see what's wrong regex?

line of code:

    2015-01-07 wed jan 07 11:03:43.390 dd started 

my regex:

    (?<date>(?<year>(?:\d{4}|\d{2})-(?<month>\d{1,2})-(?<day>\d{1,2})))\s(?<logentry1>.*)\s(?<logentry2>.*)\s(?<logentry3>.*)\s(?<time>(?<hour>\d{2}):(?<minutes>\d{2}):(?<seconds>\d{2}).(?<milli>\d{0,3}))\s(?<logentry>.*) 

why can not single out 'year'? ran through regex101.com , here capture group values:

    match 1     date    [0-10]  `2015-01-07`     year    [0-10]  `2015-01-07`     month   [5-7]   `01`     day [8-10]  `07`     logentry1   [11-14] `wed`     logentry2   [15-18] `jan`     logentry3   [19-21] `07`     time    [22-34] `11:03:43.390`     hour    [22-24] `11`     minutes [25-27] `03`     seconds [28-30] `43`     milli   [31-34] `390`     logentry    [35-45] `dd started` 

you should move parenthesis ))) (?:\d{4}|\d{2})):

(?<date>(?<year>(?:\d{4}|\d{2}))-(?<month>\d{1,2})-(?<day>\d{1,2}))\s(?<logentry1>.*)\s(?<logentry2>.*)\s(?<logentry3>.*)\s(?<time>(?<hour>\d{2}):(?<minutes>\d{2}):(?<seconds>\d{2}).(?<milli>\d{0,3}))\s(?<logentry>.*) 

actually, i'd rather use verbose regex option such long regex , use comments # year keep track of have inside:

var rx = new regex(@"(?<date>      (?<year>        (?:\d{4}|\d{2})      )                  # year      -      (?<month>\d{1,2})      -      (?<day>\d{1,2})    )                    # date    \s    (?<logentry1>.*)    \s    (?<logentry2>.*)    \s    (?<logentry3>.*)    \s    (?<time>      (?<hour>\d{2})      :      (?<minutes>\d{2})      :      (?<seconds>\d{2})      .      (?<milli>\d{0,3})    )    \s    (?<logentry>.*)", regexoptions.ignorepatternwhitespace); 

result: