Regular Expressions 101

Group 1(0[1-9]|1[0-9]|2[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 Alternative1[0-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

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

3rd Alternative2[0-9]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-9]

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

4th Alternative3[01]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

.any character (except for line terminators)

Group 2(0[1-9]|1[012])

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[012]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[012]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

.any character (except for line terminators)

Group 3([19]{2})?

?repeats the group contents below at most once:

Character Class[19]{2}

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

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

Group 4([1-9]{2})

Character Class[1-9]{2}

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

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(0[1-9]|1[0-9]|2[0-9]|3[01]).(0[1-9]|1[012]).([19]{2})?([1-9]{2})

Test String
New

31/09/1997

Regular Expression

Test StringNew

ExtractionProcessing...

Test String
New

Extraction
Processing...