Regular Expressions 101

^start of string

Character Class[1-9]

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

\d{5}a Unicode decimal digit, repeated exactly 5 times

Character Class[1-9]

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

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

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

1st Alternative(0[1-9])

Group 2(0[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])

Group 3(1[0-2])

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-2]

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

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

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

Group 5((0[1-9])|3[0-1])

1st Alternative(0[1-9])

Group 6(0[1-9])

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

2nd Alternative3[0-1]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[0-1]

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

2nd Alternative(([1|2]\d)|3[0-1])

Group 7(([1|2]\d)|3[0-1])

1st Alternative([1|2]\d)

Group 8([1|2]\d)

Character Class[1|2]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

\da Unicode decimal digit

2nd Alternative3[0-1]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[0-1]

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

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

Group 9([0-9]|X)

1st Alternative[0-9]

2nd AlternativeX

$end of string, or before its final line terminator

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

Regular Expression

^[1-9]\d{5}[1-9]\d{3}((0[1-9])|(1[0-2]))(((0[1-9])|3[0-1])|(([1|2]\d)|3[0-1]))\d{3}([0-9]|X)$

New

342501199002210613

Regular Expression

Extraction