regex101: Best birth date check

Pro

1st Alternative^(((19|[2-9][0-9])[0-9][0-9])-((0[1-9]|1[012])-(0[1-9]|1[0-9]|2[0-8])|((0[13578]|1[02])-(29|30|31))|(0[469]|11)-(29|30)))

^start of line

Group 1(((19|[2-9][0-9])[0-9][0-9])-((0[1-9]|1[012])-(0[1-9]|1[0-9]|2[0-8])|((0[13578]|1[02])-(29|30|31))|(0[469]|11)-(29|30)))

Group 2((19|[2-9][0-9])[0-9][0-9])

Group 3(19|[2-9][0-9])

1st Alternative19

19the literal text 19

2nd Alternative[2-9][0-9]

Character Class[2-9]

2-9one character from 2 (50₁₀) to 9 (57₁₀)

Character Class[0-9]

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

Character Class[0-9]

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

Character Class[0-9]

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 4((0[1-9]|1[012])-(0[1-9]|1[0-9]|2[0-8])|((0[13578]|1[02])-(29|30|31))|(0[469]|11)-(29|30))

1st Alternative(0[1-9]|1[012])-(0[1-9]|1[0-9]|2[0-8])

Group 5(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)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 6(0[1-9]|1[0-9]|2[0-8])

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[0-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

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

3rd Alternative2[0-8]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-8]

0-8one character from 0 (48₁₀) to 8 (56₁₀)

2nd Alternative((0[13578]|1[02])-(29|30|31))

Group 7((0[13578]|1[02])-(29|30|31))

3rd Alternative(0[469]|11)-(29|30)

2nd Alternative((19|[2-9][0-9])(00|04|08|12|16|20|24|28|32|36|40|44|48|52|56|60|64|68|72|76|80|84|88|92|96)-02-29)$

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

26 tokens

Regular Expression

^(((19|[2-9][0-9])[0-9][0-9])-((0[1-9]|1[012])-(0[1-9]|1[0-9]|2[0-8])|((0[13578]|1[02])-(29|30|31))|(0[469]|11)-(29|30)))|((19|[2-9][0-9])(00|04|08|12|16|20|24|28|32|36|40|44|48|52|56|60|64|68|72|76|80|84|88|92|96)-02-29)$

Regular Expressions 101

Regular Expression

Unit Tests