Regular Expressions 101

Explanation
Pro

1st Alternative[0-9]{10,11}

Character Class[0-9]{10,11}

{10,11}matches between 10 and 11 characters from the set below:

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

2nd Alternative2[0-9]{3,3}-(0[1-9]|[1][0-2])-(0[1-9]|[1-2][0-9]|3[0-1])

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-9]{3,3}

{3,3}matches exactly 3 characters from the set below:

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

1st Alternative0[1-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

2nd 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 - (45₁₀ / 55₈ / 2D₁₆)

Group 2(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)

the literal ↵ (10₁₀ / 12₈ / A₁₆)

Detailed match information will be displayed here automatically.

25 tokens

[0-9]{10,11}|2[0-9]{3,3}-(0[1-9]|[1][0-2])-(0[1-9]|[1-2][0-9]|3[0-1])