Regular Expressions 101

^start of line

Group 1((?:19|20)(?:(?:(?:[02468][048]|[13579][26])\/02\/(?:0[1-9]|[12]\d))|(?:(?![02468][048]|[13579][26])\d){2}\/02\/(?:0[1-9]|[1]\d|2[0-8])|\d{2}\/(?:(?:0[469]|11)\/(?:0[1-9]|[12]\d|30)|(?:0[13578]|10|12)\/(?:0[1-9]|[12]\d|30|31))))

Non-Capturing Group(?:19|20)

1st Alternative19

19the literal text 19

2nd Alternative20

20the literal text 20

Non-Capturing Group(?:(?:(?:[02468][048]|[13579][26])\/02\/(?:0[1-9]|[12]\d))|(?:(?![02468][048]|[13579][26])\d){2}\/02\/(?:0[1-9]|[1]\d|2[0-8])|\d{2}\/(?:(?:0[469]|11)\/(?:0[1-9]|[12]\d|30)|(?:0[13578]|10|12)\/(?:0[1-9]|[12]\d|30|31)))

1st Alternative(?:(?:[02468][048]|[13579][26])\/02\/(?:0[1-9]|[12]\d))

Non-Capturing Group(?:(?:[02468][048]|[13579][26])\/02\/(?:0[1-9]|[12]\d))

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)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

02the literal text 02

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:0[1-9]|[12]\d)

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]\d

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

\da digit

2nd Alternative(?:(?![02468][048]|[13579][26])\d){2}\/02\/(?:0[1-9]|[1]\d|2[0-8])

Non-Capturing Group(?:(?![02468][048]|[13579][26])\d){2}

{2}repeats the group contents below exactly 2 times:

Negative Lookahead(?![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]

\da digit

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

02the literal text 02

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:0[1-9]|[1]\d|2[0-8])

3rd Alternative\d{2}\/(?:(?:0[469]|11)\/(?:0[1-9]|[12]\d|30)|(?:0[13578]|10|12)\/(?:0[1-9]|[12]\d|30|31))

$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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^((?:19|20)(?:(?:(?:[02468][048]|[13579][26])\/02\/(?:0[1-9]|[12]\d))|(?:(?![02468][048]|[13579][26])\d){2}\/02\/(?:0[1-9]|[1]\d|2[0-8])|\d{2}\/(?:(?:0[469]|11)\/(?:0[1-9]|[12]\d|30)|(?:0[13578]|10|12)\/(?:0[1-9]|[12]\d|30|31))))$

Regular Expressions 101

Regular Expression

Test String
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Regular Expression

Test StringNew

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Test String
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