regex101: Date yyyy/mm/dd

^start of string

20the literal text 20

Group 1(((([248][048])|([13579][26]))\/(((0[13578]|1[02])\/([0-2][0-9]|3[01]))|((0[469]|11)\/([0-2][0-9]|30))|(02\/([0-2][0-9]))))|((([248][1-35-79])|([13579][013-57-9]))\/(((0[13578]|1[02])\/([0-2][0-9]|3[01]))|((0[469]|11)\/([0-2][0-9]|30))|(02\/(((0|1)[0-9])|(2[0-8]))))))

1st Alternative((([248][048])|([13579][26]))\/(((0[13578]|1[02])\/([0-2][0-9]|3[01]))|((0[469]|11)\/([0-2][0-9]|30))|(02\/([0-2][0-9]))))

Group 2((([248][048])|([13579][26]))\/(((0[13578]|1[02])\/([0-2][0-9]|3[01]))|((0[469]|11)\/([0-2][0-9]|30))|(02\/([0-2][0-9]))))

Group 3(([248][048])|([13579][26]))

1st Alternative([248][048])

Group 4([248][048])

Character Class[248]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

Character Class[048]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

2nd Alternative([13579][26])

Group 5([13579][26])

Character Class[13579]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

7the literal 7 (55₁₀ / 67₈ / 37₁₆)

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

Character Class[26]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

6the literal 6 (54₁₀ / 66₈ / 36₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 6(((0[13578]|1[02])\/([0-2][0-9]|3[01]))|((0[469]|11)\/([0-2][0-9]|30))|(02\/([0-2][0-9])))

1st Alternative((0[13578]|1[02])\/([0-2][0-9]|3[01]))

Group 7((0[13578]|1[02])\/([0-2][0-9]|3[01]))

Group 8(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)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 9([0-2][0-9]|3[01])

1st Alternative[0-2][0-9]

Character Class[0-2]

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

Character Class[0-9]

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

2nd Alternative3[01]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[01]

2nd Alternative((0[469]|11)\/([0-2][0-9]|30))

3rd Alternative(02\/([0-2][0-9]))

2nd Alternative((([248][1-35-79])|([13579][013-57-9]))\/(((0[13578]|1[02])\/([0-2][0-9]|3[01]))|((0[469]|11)\/([0-2][0-9]|30))|(02\/(((0|1)[0-9])|(2[0-8])))))

$end of string, or before its final line terminator

Search reference

Regular Expression

^20(((([248][048])|([13579][26]))\/(((0[13578]|1[02])\/([0-2][0-9]|3[01]))|((0[469]|11)\/([0-2][0-9]|30))|(02\/([0-2][0-9]))))|((([248][1-35-79])|([13579][013-57-9]))\/(((0[13578]|1[02])\/([0-2][0-9]|3[01]))|((0[469]|11)\/([0-2][0-9]|30))|(02\/(((0|1)[0-9])|(2[0-8]))))))$

Test String
New

2015/02/28

Regular Expression

Test StringNew

Test String
New