regex101: PCRE2 (PHP) Match Workspace

Group 1(^(?:(?:(?:31(?:(?:([-.\/])(?:0?[13578]|1[02])\2)|(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)\3)))|(?:(?:29|30)(?:(?:([-.\/])(?:0?[13-9]|1[0-2])\4)|(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|Apr|APR|May|MAY|Jun|JUN|Jul|JUL|Aug|AUG|Sep|SEP|Oct|OCT|Nov|NOV|Dec|DEC)\5))))(?:(?:1[6-9]|[2-9]\d)?\d{2}))$|^(?:29(?:(?:([-.\/])(?:0?2)\6)|(?:([-.\/ ])(?:Feb|FEB)\7))(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00)))$|^(?:(?:0?[1-9]|1\d|2[0-8])(?:(?:([-.\/])(?:(?:0?[1-9]|(?:1[0-2])))\8)|(?:([-.\/ ])(?:Jan|JAN|Feb|FEB|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)\9))(?:(?:1[6-9]|[2-9]\d)?\d{2}))$)

1st Alternative^(?:(?:(?:31(?:(?:([-.\/])(?:0?[13578]|1[02])\2)|(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)\3)))|(?:(?:29|30)(?:(?:([-.\/])(?:0?[13-9]|1[0-2])\4)|(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|Apr|APR|May|MAY|Jun|JUN|Jul|JUL|Aug|AUG|Sep|SEP|Oct|OCT|Nov|NOV|Dec|DEC)\5))))(?:(?:1[6-9]|[2-9]\d)?\d{2}))$

^start of line

Non-Capturing Group(?:(?:(?:31(?:(?:([-.\/])(?:0?[13578]|1[02])\2)|(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)\3)))|(?:(?:29|30)(?:(?:([-.\/])(?:0?[13-9]|1[0-2])\4)|(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|Apr|APR|May|MAY|Jun|JUN|Jul|JUL|Aug|AUG|Sep|SEP|Oct|OCT|Nov|NOV|Dec|DEC)\5))))(?:(?:1[6-9]|[2-9]\d)?\d{2}))

Non-Capturing Group(?:(?:31(?:(?:([-.\/])(?:0?[13578]|1[02])\2)|(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)\3)))|(?:(?:29|30)(?:(?:([-.\/])(?:0?[13-9]|1[0-2])\4)|(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|Apr|APR|May|MAY|Jun|JUN|Jul|JUL|Aug|AUG|Sep|SEP|Oct|OCT|Nov|NOV|Dec|DEC)\5))))

1st Alternative(?:31(?:(?:([-.\/])(?:0?[13578]|1[02])\2)|(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)\3)))

Non-Capturing Group(?:31(?:(?:([-.\/])(?:0?[13578]|1[02])\2)|(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)\3)))

31the literal text 31

Non-Capturing Group(?:(?:([-.\/])(?:0?[13578]|1[02])\2)|(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)\3))

1st Alternative(?:([-.\/])(?:0?[13578]|1[02])\2)

Non-Capturing Group(?:([-.\/])(?:0?[13578]|1[02])\2)

Group 2([-.\/])

Character Class[-.\/]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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)

\2the text saved by group 2

2nd Alternative(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)\3)

Non-Capturing Group(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)\3)

Group 3([-.\/ ])

Character Class[-.\/ ]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:Jan|JAN|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)

1st AlternativeJan

Janthe literal text Jan (case sensitive)

2nd AlternativeJAN

JANthe literal text JAN (case sensitive)

3rd AlternativeMar

Marthe literal text Mar (case sensitive)

4th AlternativeMAR

MARthe literal text MAR (case sensitive)

5th AlternativeMay

6th AlternativeMAY

7th AlternativeJul

8th AlternativeJUL

9th AlternativeAug

10th AlternativeAUG

11th AlternativeOct

12th AlternativeOCT

13th AlternativeDec

14th AlternativeDEC

\3the text saved by group 3

2nd Alternative(?:(?:29|30)(?:(?:([-.\/])(?:0?[13-9]|1[0-2])\4)|(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|Apr|APR|May|MAY|Jun|JUN|Jul|JUL|Aug|AUG|Sep|SEP|Oct|OCT|Nov|NOV|Dec|DEC)\5)))

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

$end of line

2nd Alternative^(?:29(?:(?:([-.\/])(?:0?2)\6)|(?:([-.\/ ])(?:Feb|FEB)\7))(?:(?: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])))\8)|(?:([-.\/ ])(?:Jan|JAN|Feb|FEB|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)\9))(?:(?:1[6-9]|[2-9]\d)?\d{2}))$

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

Search reference

Regular Expression

(^(?:(?:(?:31(?:(?:([-.\/])(?:0?[13578]|1[02])\2)|(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)\3)))|(?:(?:29|30)(?:(?:([-.\/])(?:0?[13-9]|1[0-2])\4)|(?:([-.\/ ])(?:Jan|JAN|Mar|MAR|Apr|APR|May|MAY|Jun|JUN|Jul|JUL|Aug|AUG|Sep|SEP|Oct|OCT|Nov|NOV|Dec|DEC)\5))))(?:(?:1[6-9]|[2-9]\d)?\d{2}))$|^(?:29(?:(?:([-.\/])(?:0?2)\6)|(?:([-.\/ ])(?:Feb|FEB)\7))(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00)))$|^(?:(?:0?[1-9]|1\d|2[0-8])(?:(?:([-.\/])(?:(?:0?[1-9]|(?:1[0-2])))\8)|(?:([-.\/ ])(?:Jan|JAN|Feb|FEB|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)\9))(?:(?:1[6-9]|[2-9]\d)?\d{2}))$)

Unit Tests

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