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

Unit Test Summary

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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}))))

Unit Tests

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