Regular Expressions 101

^start of line

Group 1(([1-2][0-9])|(3[0-1])|(0?[1-9]))

1st Alternative([1-2][0-9])

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

Character Class[1-2]

1-2one character from 1 (49₁₀) to 2 (50₁₀)

Character Class[0-9]

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

2nd Alternative(3[0-1])

Group 3(3[0-1])

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[0-1]

0-1one character from 0 (48₁₀) to 1 (49₁₀)

3rd Alternative(0?[1-9])

Group 4(0?[1-9])

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

Character Class[1-9]

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 5((0?[1-9])|(1[0-2]))

1st Alternative(0?[1-9])

Group 6(0?[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 Alternative(1[0-2])

Group 7(1[0-2])

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-2]

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 8(\d{4})

\d{4}a digit, repeated exactly 4 times

$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.

25 tokens

Regular Expression

^(([1-2][0-9])|(3[0-1])|(0?[1-9]))\/((0?[1-9])|(1[0-2]))\/(\d{4})$

New

08/04/2022
8/4/2022
30/4/2021
33/5/2022
2/13/2030

08/04/2022
8/4/2022
30/4/2021
33/5/2022
2/13/2030