regex101: PCRE (Legacy) Match Workspace

Explanation

Pro

^start of line

Group 1((?:(?=29[\/\-.]0?2[\/\-.](?:[1-9]\d)?(?:[02468][048]|[13579][26])(?!\d))29)|(?:(?=31[\/\-.](?!11)0?[13578]|1[02])31)|(?:(?=\d?\d[\/\-.]\d?\d[\/\-.])(?!29[\/\-.]0?2)(?!31)(?:[12][0-9]|30|0?[1-9])))

1st Alternative(?:(?=29[\/\-.]0?2[\/\-.](?:[1-9]\d)?(?:[02468][048]|[13579][26])(?!\d))29)

Non-Capturing Group(?:(?=29[\/\-.]0?2[\/\-.](?:[1-9]\d)?(?:[02468][048]|[13579][26])(?!\d))29)

Positive Lookahead(?=29[\/\-.]0?2[\/\-.](?:[1-9]\d)?(?:[02468][048]|[13579][26])(?!\d))

29the literal text 29

Character Class[\/\-.]

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[\/\-.]

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

?repeats the group contents below at most once:

Character Class[1-9]

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

\da digit

Non-Capturing Group(?:[02468][048]|[13579][26])

1st Alternative[02468][048]

Character Class[02468]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

6the literal 6 (54₁₀ / 66₈ / 36₁₆)

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

Character Class[048]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

2nd Alternative[13579][26]

Character Class[13579]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

7the literal 7 (55₁₀ / 67₈ / 37₁₆)

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

Character Class[26]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

6the literal 6 (54₁₀ / 66₈ / 36₁₆)

Negative Lookahead(?!\d)

\da digit

29the literal text 29

2nd Alternative(?:(?=31[\/\-.](?!11)0?[13578]|1[02])31)

Non-Capturing Group(?:(?=31[\/\-.](?!11)0?[13578]|1[02])31)

Positive Lookahead(?=31[\/\-.](?!11)0?[13578]|1[02])

1st Alternative31[\/\-.](?!11)0?[13578]

31the literal text 31

Character Class[\/\-.]

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negative Lookahead(?!11)

11the literal text 11

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)

31the literal text 31

3rd Alternative(?:(?=\d?\d[\/\-.]\d?\d[\/\-.])(?!29[\/\-.]0?2)(?!31)(?:[12][0-9]|30|0?[1-9]))

Character Class[\/\-.]

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

Character Class[\/\-.]

Group 3((?:[1-9]\d)?\d{2})

$end of line

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

Quick Reference

25 tokens

Regular Expression

^((?:(?=29[\/\-.]0?2[\/\-.](?:[1-9]\d)?(?:[02468][048]|[13579][26])(?!\d))29)|(?:(?=31[\/\-.](?!11)0?[13578]|1[02])31)|(?:(?=\d?\d[\/\-.]\d?\d[\/\-.])(?!29[\/\-.]0?2)(?!31)(?:[12][0-9]|30|0?[1-9])))[\/\-.](0?[1-9]|1[0-2])[\/\-.]((?:[1-9]\d)?\d{2})$

New

Substitution