regex101: PCRE (Legacy) Match Workspace

1st Alternative^(?:(31)(\D)(0?[13578]|1[02])\2|(29|30)(\D)(0?[13-9]|1[0-2])\5|(0?[1-9]|1\d|2[0-8])(\D)(0?[1-9]|1[0-2])\8)((?:1[6-9]|[2-9]\d)?\d{2})$

^start of line

Non-Capturing Group(?:(31)(\D)(0?[13578]|1[02])\2|(29|30)(\D)(0?[13-9]|1[0-2])\5|(0?[1-9]|1\d|2[0-8])(\D)(0?[1-9]|1[0-2])\8)

1st Alternative(31)(\D)(0?[13578]|1[02])\2

Group 1(31)

31the literal text 31

Group 2(\D)

\Dany character that's not a digit

Group 3(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(29|30)(\D)(0?[13-9]|1[0-2])\5

Group 4(29|30)

1st Alternative29

29the literal text 29

2nd Alternative30

30the literal text 30

Group 5(\D)

\Dany character that's not a digit

Group 6(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)

\5the text saved by group 5

3rd Alternative(0?[1-9]|1\d|2[0-8])(\D)(0?[1-9]|1[0-2])\8

Group 7(0?[1-9]|1\d|2[0-8])

1st Alternative0?[1-9]

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

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

2nd Alternative1\d

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\da digit

3rd Alternative2[0-8]

Group 8(\D)

Group 9(0?[1-9]|1[0-2])

\8the text saved by group 8

Group 10((?:1[6-9]|[2-9]\d)?\d{2})

$end of line

2nd Alternative^(29)(\D)(0?2)\12((?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:16|[2468][048]|[3579][26])00)$

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)(\D)(0?[13578]|1[02])\2|(29|30)(\D)(0?[13-9]|1[0-2])\5|(0?[1-9]|1\d|2[0-8])(\D)(0?[1-9]|1[0-2])\8)((?:1[6-9]|[2-9]\d)?\d{2})$|^(29)(\D)(0?2)\12((?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:16|[2468][048]|[3579][26])00)$

New

30a01a2019
1)2)2015
2,07,1980