regex101: iso8610 extended

Pro

Group 1((19\d\d|20\d\d)-(0\d|1[0-2])-([0-2]\d|30|31))

Group 2(19\d\d|20\d\d)

1st Alternative19\d\d

19the literal text 19

\da digit

2nd Alternative20\d\d

20the literal text 20

\da digit

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 3(0\d|1[0-2])

1st Alternative0\d

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\da digit

2nd Alternative1[0-2]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-2]

0-2one character from 0 (48₁₀) to 2 (50₁₀)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 4([0-2]\d|30|31)

1st Alternative[0-2]\d

Character Class[0-2]

0-2one character from 0 (48₁₀) to 2 (50₁₀)

\da digit

2nd Alternative30

30the literal text 30

3rd Alternative31

31the literal text 31

Tthe literal T (84₁₀ / 124₈ / 54₁₆) (case sensitive)

Group 5((\d{2}):(\d{2}):(\d{2}))

Group 6(\d{2})

\d{2}a digit, repeated exactly 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group 7(\d{2})

\d{2}a digit, repeated exactly 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group 8(\d{2})

\d{2}a digit, repeated exactly 2 times

Non-Capturing Group(?:\.(\d{3,6}))?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 9(\d{3,6})

\d{3,6}a digit, repeated between 3 and 6 times

Non-Capturing Group(?:((?:([+-])(?:(0\d|1[012]))):?([0-5]\d))|Z?)

1st Alternative((?:([+-])(?:(0\d|1[012]))):?([0-5]\d))

Group 10((?:([+-])(?:(0\d|1[012]))):?([0-5]\d))

Non-Capturing Group(?:([+-])(?:(0\d|1[012])))

Group 11([+-])

Character Class[+-]

+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:(0\d|1[012]))

:?optionally matches the literal : (58₁₀ / 72₈ / 3A₁₆)

Group 13([0-5]\d)

2nd AlternativeZ?

25 tokens

Regular Expression

((19\d\d|20\d\d)-(0\d|1[0-2])-([0-2]\d|30|31))T((\d{2}):(\d{2}):(\d{2}))(?:\.(\d{3,6}))?(?:((?:([+-])(?:(0\d|1[012]))):?([0-5]\d))|Z?)

New

2008
2004-04-14
1997-01-27T18:57Z
2010-14-21T08:12:17.243+07:00

2010-12-21T08:12:17.243Z
2010-12-21T08:12:17.243
2010-11-21T08:12:17.243+07:00
2010-11-01T08:12:17.243+07:00
2010-12-11T08:12:17.243+0700
2010-01-21T08:12:17.243+07:00
2010-11-31T08:12:17.243+07:00
2010-14-21T08:12:17.243-37:00
2010-11-32T08:12:17.243+07:00
2010-14-21T08:12:17.243+0000
2010-14-21T08:12:17.243+1000
2010-11-21T08:12:17.243+0060
2010-14-21T08:12:17.243+1000
2010-14-21T08:12:17.243+1000
Non-Matches	
3:00, 2/28/2003
2004-07-12 14:25:59
1900-01-01 00:00:00
9999-12-31 23:59:59
Non-Matches	
04-07-12 14:25:59
20004-07-12 14:25
2004/07/12 14:25:59