Regular Expressions 101

^start of line

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

1st Alternative([0-2][1-9]\.((0[1-9])|1[0-2]))

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

Character Class[0-2]

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

Character Class[1-9]

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

1st Alternative(0[1-9])

Group 4(0[1-9])

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

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)

2nd Alternative((3[0,1])\.((0[1,3-9])|(1[0-2])))

Group 5((3[0,1])\.((0[1,3-9])|(1[0-2])))

Group 6(3[0,1])

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[0,1]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 7((0[1,3-9])|(1[0-2]))

1st Alternative(0[1,3-9])

Group 8(0[1,3-9])

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1,3-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

2nd Alternative(1[0-2])

Group 9(1[0-2])

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-2]

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 10(\d{4})

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

25 tokens

Regular Expression

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

New

Regular Expression

Substitution