Regular Expressions 101

Pro

1st Alternative(((1[4-9])|([2-9][0-9]))(03)(2021))

Group 1(((1[4-9])|([2-9][0-9]))(03)(2021))

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

1st Alternative(1[4-9])

Group 3(1[4-9])

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[4-9]

4-9one character from 4 (52₁₀) to 9 (57₁₀)

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

Group 4([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)

Group 5(03)

03the literal text 03

Group 6(2021)

2021the literal text 2021

2nd Alternative(([0-9]{2})(0([4-9])|(1[0-2]))(2021))

Group 7(([0-9]{2})(0([4-9])|(1[0-2]))(2021))

Group 8([0-9]{2})

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

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

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

1st Alternative0([4-9])

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Group 10([4-9])

Character Class[4-9]

4-9one character from 4 (52₁₀) to 9 (57₁₀)

2nd Alternative(1[0-2])

Group 11(1[0-2])

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-2]

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

Group 12(2021)

2021the literal text 2021

3rd Alternative(((1[0-4])|([0-0][0-9]))(03)(2022))

Group 13(((1[0-4])|([0-0][0-9]))(03)(2022))

4th Alternative(([0-9]{2})(0([0-2]))(2022))

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

No unit tests · Add a test to get started

25 tokens

Regular Expression

(((1[4-9])|([2-9][0-9]))(03)(2021))|(([0-9]{2})(0([4-9])|(1[0-2]))(2021))|(((1[0-4])|([0-0][0-9]))(03)(2022))|(([0-9]{2})(0([0-2]))(2022))

Unit Tests

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