regex101: dd-mm-yyyy leap year v2

1st Alternative^(?:(?:31-(?:0?[13578]|1[02]))-|(?:(?:29|30)-(?:0?[1,3-9]|1[0-2])-))(?:(?:19|20)?\d{2})

^start of string

Non-Capturing Group(?:(?:31-(?:0?[13578]|1[02]))-|(?:(?:29|30)-(?:0?[1,3-9]|1[0-2])-))

1st Alternative(?:31-(?:0?[13578]|1[02]))-

Non-Capturing Group(?:31-(?:0?[13578]|1[02]))

31-the literal text 31-

Non-Capturing Group(?:0?[13578]|1[02])

1st Alternative0?[13578]

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[13578]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

7the literal 7 (55₁₀ / 67₈ / 37₁₆)

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

2nd Alternative1[02]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[02]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative(?:(?:29|30)-(?:0?[1,3-9]|1[0-2])-)

Non-Capturing Group(?:(?:29|30)-(?:0?[1,3-9]|1[0-2])-)

Non-Capturing Group(?:29|30)

1st Alternative29

29the literal text 29

2nd Alternative30

30the literal text 30

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:0?[1,3-9]|1[0-2])

1st Alternative0?[1,3-9]

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1,3-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

3-9one character from 3 (51₁₀) to 9 (57₁₀)

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)

Non-Capturing Group(?:(?:19|20)?\d{2})

Non-Capturing Group(?:19|20)?

?repeats the group contents below at most once:

1st Alternative19

19the literal text 19

2nd Alternative20

20the literal text 20

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

2nd Alternative(?:29-0?2-(?:(?:(?:19|20)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))

Non-Capturing Group(?:29-0?2-(?:(?:(?:19|20)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))

29-the literal text 29-

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

2-the literal text 2-

Non-Capturing Group(?:(?:(?:19|20)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00)))

3rd Alternative(?:0?[1-9]|1\d|2[0-8])(?:(?:0?[1-9])|(?:1[0-2]))-(?:(?:19|20)?\d{2})$

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

25 tokens

Regular Expression

^(?:(?:31-(?:0?[13578]|1[02]))-|(?:(?:29|30)-(?:0?[1,3-9]|1[0-2])-))(?:(?:19|20)?\d{2})|(?:29-0?2-(?:(?:(?:19|20)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))|(?:0?[1-9]|1\d|2[0-8])(?:(?:0?[1-9])|(?:1[0-2]))-(?:(?:19|20)?\d{2})$

New

31-07-2005

Extraction

31-07-2005