Regular Expressions 101

Non-Capturing Group(?:(?:0?[1-9]|1[0-2])\/(?:0?[1-9]|1[0-9]|2[0-9])|(?:(?!02)(?:0?[1-9]|1[0-2])-(?:30))|(?:(?:0?[13578]|1[02])-31))

1st Alternative(?:0?[1-9]|1[0-2])\/(?:0?[1-9]|1[0-9]|2[0-9])

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

1st Alternative0?[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 Alternative1[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)

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

1st Alternative0?[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 Alternative1[0-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

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

3rd Alternative2[0-9]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-9]

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

2nd Alternative(?:(?!02)(?:0?[1-9]|1[0-2])-(?:30))

Non-Capturing Group(?:(?!02)(?:0?[1-9]|1[0-2])-(?:30))

Negative Lookahead(?!02)

02the literal text 02

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

1st Alternative0?[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 Alternative1[0-2]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-2]

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:30)

30the literal text 30

3rd Alternative(?:(?:0?[13578]|1[02])-31)

Non-Capturing Group(?:(?:0?[13578]|1[02])-31)

Non-Capturing Group(?:0?[13578]|1[02])

-31the literal text -31

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:19|20)

Character Class[0-9]{2}

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

(?:(?:0?[1-9]|1[0-2])\/(?:0?[1-9]|1[0-9]|2[0-9])|(?:(?!02)(?:0?[1-9]|1[0-2])-(?:30))|(?:(?:0?[13578]|1[02])-31))\/(?:19|20)[0-9]{2}

New

09/04/1980
5/9/1990