regex101: JavaScript Match Workspace

Pro

1st Alternative(?:(?:31(\/|-|\.)(?:0?[13578]|1[02]))\1|(?:(?:29|30)(\/|-|\.)(?:0?[1,3-9]|1[0-2])\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})(?=\W)

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

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

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

31the literal text 31

Group 1(\/|-|\.)

1st Alternative\/

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

3rd Alternative\.

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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)

\1the text saved by group 1

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

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

Non-Capturing Group(?:29|30)

1st Alternative29

29the literal text 29

2nd Alternative30

30the literal text 30

Group 2(\/|-|\.)

1st Alternative\/

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

3rd Alternative\.

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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]

\2the text saved by group 2

Non-Capturing Group(?:(?:1[6-9]|[2-9]\d)?\d{2})

Positive Lookahead(?=\W)

2nd Alternative\b(?:29(\/|-|\.)0?2\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])?|(?:(?:16|[2468][048]|[3579][26])00)?)))(?=\W)

3rd Alternative\b(?:0?[1-9]|1\d|2[0-8])(\/|-|\.)(?:(?:0?[1-9])|(?:1[0-2]))(\4)?(?:(?:1[6-9]|[2-9]\d)?\d{2})?(?=\b)

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

26 tokens

Regular Expression

(?:(?:31(\/|-|\.)(?:0?[13578]|1[02]))\1|(?:(?:29|30)(\/|-|\.)(?:0?[1,3-9]|1[0-2])\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})(?=\W)|\b(?:29(\/|-|\.)0?2\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])?|(?:(?:16|[2468][048]|[3579][26])00)?)))(?=\W)|\b(?:0?[1-9]|1\d|2[0-8])(\/|-|\.)(?:(?:0?[1-9])|(?:1[0-2]))(\4)?(?:(?:1[6-9]|[2-9]\d)?\d{2})?(?=\b)

New

26.11
26.11.2016
29.2.2000
29/2/2015
abcde 27.11.2016 fghi 
01/02/2000
31/01/2000
32/01/2000
01/1/2000
01/1/01
27.01.
01.12
fasd 24.10.
28/02/2001
30/04/2000
31/04/2000
31/07/2000
31/08/2000
31/09/2000
01/12/2000

01/15/2000