regex101: PCRE (Legacy) Match Workspace

1st Alternative^(?:(?:(?:31(\\\/|-|\\.|\\x20))(?:0?[13578]|1[02]))\1|(?:(?:29|30)([-\/])(?:0?[1,3-9]|1[0-2])\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})$

^start of string

Non-Capturing Group(?:(?:(?:31(\\\/|-|\\.|\\x20))(?:0?[13578]|1[02]))\1|(?:(?:29|30)([-\/])(?:0?[1,3-9]|1[0-2])\2))

1st Alternative(?:(?:31(\\\/|-|\\.|\\x20))(?:0?[13578]|1[02]))\1

Non-Capturing Group(?:(?:31(\\\/|-|\\.|\\x20))(?:0?[13578]|1[02]))

Non-Capturing Group(?:31(\\\/|-|\\.|\\x20))

31the literal text 31

Group 1(\\\/|-|\\.|\\x20)

1st Alternative\\\/

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

3rd Alternative\\.

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

.any character (except for line terminators)

4th Alternative\\x20

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

x20the literal text x20 (case sensitive)

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([-\/])

Character Class[-\/]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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})

$end of string, or before its final line terminator

2nd Alternative^(?:29([-\/])0?2\3(?:(?:(?:1[6-9]|[2-9]\d)?(?: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]))\4(?:(?:1[6-9]|[2-9]\d)?\d{2})$

Global pattern flags

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

Search reference

Regular Expression

^(?:(?:(?:31(\\\/|-|\\.|\\x20))(?:0?[13578]|1[02]))\1|(?:(?:29|30)([-\/])(?:0?[1,3-9]|1[0-2])\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})$|^(?:29([-\/])0?2\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:0?[1-9]|1\d|2[0-8])([-\/])(?:(?:0?[1-9])|(?:1[0-2]))\4(?:(?:1[6-9]|[2-9]\d)?\d{2})$

Unit Tests

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