Regular Expressions 101

Group 1(\d{4})

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

1st Alternative(0[1-9])

Group 3(0[1-9])

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

2nd Alternative(1[0-2])

Group 4(1[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)

Group 5(0[1-9]|[12][0-9]|3[01])

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[12][0-9]

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-9]

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

3rd Alternative3[01]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\ the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:[0-1]?[0-9]|[2][1-4])

1st Alternative[0-1]?[0-9]

Character Class[0-1]?

?matches at most one character from the set below:

0-1one character from 0 (48₁₀) to 1 (49₁₀)

Character Class[0-9]

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

2nd Alternative[2][1-4]

Character Class[2]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[1-4]

1-4one character from 1 (49₁₀) to 4 (52₁₀)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-5]?

?matches at most one character from the set below:

0-5one character from 0 (48₁₀) to 5 (53₁₀)

Character Class[0-9]

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-5]?

Character Class[0-9]

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

Search reference

Regular Expression

(\d{4})\/((0[1-9])|(1[0-2]))\/(0[1-9]|[12][0-9]|3[01])\ (?:[0-1]?[0-9]|[2][1-4]):[0-5]?[0-9]:[0-5]?[0-9]

Unit Tests

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