Regular Expressions 101

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

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[1-2][0-9]

Character Class[1-2]

1-2one character from 1 (49₁₀) to 2 (50₁₀)

Character Class[0-9]

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

3rd Alternative3[0-1]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[0-1]

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

.any character (except for line terminators)

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

1st Alternative0[1-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

2nd Alternative1[1-2]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[1-2]

1-2one character from 1 (49₁₀) to 2 (50₁₀)

.any character (except for line terminators)

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

\sany whitespace character

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

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

Character Class[0-1]

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

Character Class[0-9]

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

2nd Alternative2[0-3]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-3]

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

.any character (except for line terminators)

Character Class[0-5]

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

Character Class[0-9]

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

Global pattern flags

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

No unit tests · Add a test to get started

Search reference

Regular Expression

(0[1-9]|[1-2][0-9]|3[0-1]).(0[1-9]|1[1-2]).\d{4}\s([0-1][0-9]|2[0-3]).[0-5][0-9]

Unit Tests

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