Regular Expressions 101

Explanation

Pro

Group 1(((((0[1-9]|[1-2][0-9]|30)-(0[13-9]|1[0-2]))|((0[1-9]|1[0-9]|2[0-8])-02)|(31-(0[13578]|1[02])))-\d{4})|(29-02-((\d{2}(([2468]0)|([02468][48])|([13579][26])))|((([02468][048])|([13579][26]))0{2}))))

1st Alternative((((0[1-9]|[1-2][0-9]|30)-(0[13-9]|1[0-2]))|((0[1-9]|1[0-9]|2[0-8])-02)|(31-(0[13578]|1[02])))-\d{4})

Group 2((((0[1-9]|[1-2][0-9]|30)-(0[13-9]|1[0-2]))|((0[1-9]|1[0-9]|2[0-8])-02)|(31-(0[13578]|1[02])))-\d{4})

Group 3(((0[1-9]|[1-2][0-9]|30)-(0[13-9]|1[0-2]))|((0[1-9]|1[0-9]|2[0-8])-02)|(31-(0[13578]|1[02])))

1st Alternative((0[1-9]|[1-2][0-9]|30)-(0[13-9]|1[0-2]))

Group 4((0[1-9]|[1-2][0-9]|30)-(0[13-9]|1[0-2]))

Group 5(0[1-9]|[1-2][0-9]|30)

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[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)

3rd Alternative30

30the literal text 30

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 6(0[13-9]|1[0-2])

1st Alternative0[13-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[13-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

3-9one character from 3 (51₁₀) 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)

2nd Alternative((0[1-9]|1[0-9]|2[0-8])-02)

Group 7((0[1-9]|1[0-9]|2[0-8])-02)

Group 8(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]

-02the literal text -02

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

2nd Alternative(29-02-((\d{2}(([2468]0)|([02468][48])|([13579][26])))|((([02468][048])|([13579][26]))0{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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(((((0[1-9]|[1-2][0-9]|30)-(0[13-9]|1[0-2]))|((0[1-9]|1[0-9]|2[0-8])-02)|(31-(0[13578]|1[02])))-\d{4})|(29-02-((\d{2}(([2468]0)|([02468][48])|([13579][26])))|((([02468][048])|([13579][26]))0{2}))))

New