regex101: PCRE (Legacy) Match Workspace

^start of string

Group 1(((0[1-9]|1[012])[- \/.]?(0[1-9]|[12][0-9]|3[01])[- \/.]?(19|20)\d\d)|((((0?[13578])|(1[02]))[- \/.]?((0?[1-9])|([12][0-9])|(3[01]))|((0?[469])|(11))[- \/.]?((0?[1-9])|([12][0-9])|(30))|(0?[2])[- \/.]?((0?[1-9])|([1][0-9])|([2][0-8])))[- \/.]?(19\d{2}|20\d{2}))|(((0?[2]))[- \/.]?((0?[1-9])|([12][0-9]))[- \/.]?((19|20)(04|08|[2468][048]|[13579][26])|2000)))

1st Alternative((0[1-9]|1[012])[- \/.]?(0[1-9]|[12][0-9]|3[01])[- \/.]?(19|20)\d\d)

Group 2((0[1-9]|1[012])[- \/.]?(0[1-9]|[12][0-9]|3[01])[- \/.]?(19|20)\d\d)

Group 3(0[1-9]|1[012])

1st Alternative0[1-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

2nd Alternative1[012]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[012]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[- \/.]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 4(0[1-9]|[12][0-9]|3[01])

1st Alternative0[1-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

2nd Alternative[12][0-9]

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

3rd Alternative3[01]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[- \/.]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 5(19|20)

1st Alternative19

19the literal text 19

2nd Alternative20

20the literal text 20

\da digit

2nd Alternative((((0?[13578])|(1[02]))[- \/.]?((0?[1-9])|([12][0-9])|(3[01]))|((0?[469])|(11))[- \/.]?((0?[1-9])|([12][0-9])|(30))|(0?[2])[- \/.]?((0?[1-9])|([1][0-9])|([2][0-8])))[- \/.]?(19\d{2}|20\d{2}))

Group 6((((0?[13578])|(1[02]))[- \/.]?((0?[1-9])|([12][0-9])|(3[01]))|((0?[469])|(11))[- \/.]?((0?[1-9])|([12][0-9])|(30))|(0?[2])[- \/.]?((0?[1-9])|([1][0-9])|([2][0-8])))[- \/.]?(19\d{2}|20\d{2}))

Group 7(((0?[13578])|(1[02]))[- \/.]?((0?[1-9])|([12][0-9])|(3[01]))|((0?[469])|(11))[- \/.]?((0?[1-9])|([12][0-9])|(30))|(0?[2])[- \/.]?((0?[1-9])|([1][0-9])|([2][0-8])))

1st Alternative((0?[13578])|(1[02]))[- \/.]?((0?[1-9])|([12][0-9])|(3[01]))

Group 8((0?[13578])|(1[02]))

Character Class[- \/.]?

Group 11((0?[1-9])|([12][0-9])|(3[01]))

2nd Alternative((0?[469])|(11))[- \/.]?((0?[1-9])|([12][0-9])|(30))

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

Character Class[- \/.]?

Group 27(19\d{2}|20\d{2})

3rd Alternative(((0?[2]))[- \/.]?((0?[1-9])|([12][0-9]))[- \/.]?((19|20)(04|08|[2468][048]|[13579][26])|2000))

$end of string, or before its final line terminator

Global pattern flags

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

Search reference

Regular Expression

^(((0[1-9]|1[012])[- \/.]?(0[1-9]|[12][0-9]|3[01])[- \/.]?(19|20)\d\d)|((((0?[13578])|(1[02]))[- \/.]?((0?[1-9])|([12][0-9])|(3[01]))|((0?[469])|(11))[- \/.]?((0?[1-9])|([12][0-9])|(30))|(0?[2])[- \/.]?((0?[1-9])|([1][0-9])|([2][0-8])))[- \/.]?(19\d{2}|20\d{2}))|(((0?[2]))[- \/.]?((0?[1-9])|([12][0-9]))[- \/.]?((19|20)(04|08|[2468][048]|[13579][26])|2000)))$

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Regular Expressions 101

Regular Expression

Extraction