Regular Expressions 101

Group 1(\d{4})

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

Group 2(0\d|1[0-2])

1st Alternative0\d

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\da digit

2nd Alternative1[0-2]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-2]

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

Group 3([0-2]\d|3[0-1])

1st Alternative[0-2]\d

Character Class[0-2]

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

\da digit

2nd Alternative3[0-1]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[0-1]

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

Group 4([0-1]\d|2[0-3])

1st Alternative[0-1]\d

Character Class[0-1]

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

\da digit

2nd Alternative2[0-3]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-3]

0-3one character from 0 (48₁₀) to 3 (51₁₀)

Group 5([0-5]\d)

Character Class[0-5]

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

\da digit

Group 6([0-5]\d)

Character Class[0-5]

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

\da digit

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(\d{4})(0\d|1[0-2])([0-2]\d|3[0-1])([0-1]\d|2[0-3])([0-5]\d)([0-5]\d)