regex101: Date Regex yyyy-mm-dd with leap year

Pro

1st Alternative((20)[0-9]{2}[-](0[13578]|1[02])[-](0[1-9]|[12][0-9]|3[01]))

Group 1((20)[0-9]{2}[-](0[13578]|1[02])[-](0[1-9]|[12][0-9]|3[01]))

Group 2(20)

20the literal text 20

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Character Class[-]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 3(0[13578]|1[02])

1st Alternative0[13578]

0the 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)

Character Class[-]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 4(0[1-9]|[12][0-9]|3[01])

1st Alternative0[1-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

2nd Alternative[12][0-9]

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

3rd Alternative3[01]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2nd Alternative((20)[0-9]{2}[-](0[469]|11)[-](0[1-9]|[12][0-9]|30))

Group 5((20)[0-9]{2}[-](0[469]|11)[-](0[1-9]|[12][0-9]|30))

Group 6(20)

20the literal text 20

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Character Class[-]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 7(0[469]|11)

1st Alternative0[469]

2nd Alternative11

Character Class[-]

Group 8(0[1-9]|[12][0-9]|30)

3rd Alternative((20)[0-9]{2}[-](02)[-](0[1-9]|1[0-9]|2[0-8]))

4th Alternative((((20)(04|08|[2468][048]|[13579][26]))|2000)[-](02)[-]29)

Global pattern flags

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

25 tokens

Regular Expression

((20)[0-9]{2}[-](0[13578]|1[02])[-](0[1-9]|[12][0-9]|3[01]))|((20)[0-9]{2}[-](0[469]|11)[-](0[1-9]|[12][0-9]|30))|((20)[0-9]{2}[-](02)[-](0[1-9]|1[0-9]|2[0-8]))|((((20)(04|08|[2468][048]|[13579][26]))|2000)[-](02)[-]29)

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Regular Expressions 101

Regular Expression

Extraction