regex101: PCRE (Legacy) Match Workspace

1st Alternative^(?:31([-\/.\x20])(?:0?[13578]|1[02])\1|(?:29|30)([-\/])(?:0?[13-9]|1[0-2])\2)(?:1[6-9]|[2-9]\d)?\d{2}$

^start of line

Non-Capturing Group(?:31([-\/.\x20])(?:0?[13578]|1[02])\1|(?:29|30)([-\/])(?:0?[13-9]|1[0-2])\2)

1st Alternative31([-\/.\x20])(?:0?[13578]|1[02])\1

31the literal text 31

Group 1([-\/.\x20])

Character Class[-\/.\x20]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\x20the literal (20₁₆ / 40₈ / 32₁₀)

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?[13-9]|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?[13-9]|1[0-2])

1st Alternative0?[13-9]

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[13-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

3-9one character from 3 (51₁₀) to 9 (57₁₀)

2nd Alternative1[0-2]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-2]

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

\2the text saved by group 2

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

?repeats the group contents below at most once:

1st Alternative1[6-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[6-9]

6-9one character from 6 (54₁₀) to 9 (57₁₀)

2nd Alternative[2-9]\d

Character Class[2-9]

\da digit

\d{2}a digit, repeated exactly 2 times

$end of line

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

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([-\/.\x20])(?:0?[13578]|1[02])\1|(?:29|30)([-\/])(?:0?[13-9]|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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