Regular Expressions 101

Pro

Group 1((02\/[0-2]\d)|((01|[0][3-9]|[1][0-2])\/(31|30|[0-2]\d)))

1st Alternative(02\/[0-2]\d)

Group 2(02\/[0-2]\d)

02the literal text 02

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[0-2]

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

\da digit

2nd Alternative((01|[0][3-9]|[1][0-2])\/(31|30|[0-2]\d))

Group 3((01|[0][3-9]|[1][0-2])\/(31|30|[0-2]\d))

Group 4(01|[0][3-9]|[1][0-2])

1st Alternative01

01the literal text 01

2nd Alternative[0][3-9]

Character Class[0]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[3-9]

3-9one character from 3 (51₁₀) to 9 (57₁₀)

3rd Alternative[1][0-2]

Character Class[1]

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(31|30|[0-2]\d)

1st Alternative31

31the literal text 31

2nd Alternative30

30the literal text 30

3rd Alternative[0-2]\d

Character Class[0-2]

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

\da digit

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

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

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

((02\/[0-2]\d)|((01|[0][3-9]|[1][0-2])\/(31|30|[0-2]\d)))\/[12]\d{3}

New

01/02/2017 #pass
12/31/2017 #pass
02/31/2017
02/12/2017
1/02/2017  #fail
01/2/2017  #fail
50/01/2017 #fail
01/50/2017 #fail