Regular Expressions 101

Pro

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

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

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

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

Group 3((\b[1-9]\b|1[0-9]|2[0-8])[-]([1-9]|1[0-2]))

Group 4(\b[1-9]\b|1[0-9]|2[0-8])

1st Alternative\b[1-9]\b

\ban ASCII word boundary

Character Class[1-9]

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

\ban ASCII word boundary

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)

Character Class[-]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

1st Alternative[1-9]

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)

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

Group 6((29|30|31)[-]([13578]|1[02]))

Group 7(29|30|31)

1st Alternative29

29the literal text 29

2nd Alternative30

30the literal text 30

3rd Alternative31

31the literal text 31

Character Class[-]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 8([13578]|1[02])

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

Character Class[-]

Group 12([0-9][0-9][0-9][0-9])

2nd Alternative(29[-]2[-](([0-9][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)))

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

No unit tests · Add a test to get started

25 tokens

Regular Expression

((((\b[1-9]\b|1[0-9]|2[0-8])[-]([1-9]|1[0-2]))|((29|30|31)[-]([13578]|1[02]))|((29|30)[-]([469]|11)))[-]([0-9][0-9][0-9][0-9]))|(29[-]2[-](([0-9][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)))

Unit Tests

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