Regular Expressions 101

^start of line

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

Non-Capturing Group(?:[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)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

Non-Capturing Group(?:[1-9]|12[0-9]|3[01])

1st Alternative[1-9]

Character Class[1-9]

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

2nd Alternative12[0-9]

12the literal text 12

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 / (47₁₀ / 57₈ / 2F₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\d{3}a digit, repeated exactly 3 times

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

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

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