Regular Expressions 101

Pro

Group 1( ?ibid\., *(([0-3]?[0-9]\.)?[01]?[0-9]\.[0-9]{2,4}), *([^;]{0,50}) *(;|\) ?\.))

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

ibidthe literal text ibid (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Group 2(([0-3]?[0-9]\.)?[01]?[0-9]\.[0-9]{2,4})

Group 3([0-3]?[0-9]\.)?

?repeats the group contents below at most once:

Character Class[0-3]?

?matches at most one character from the set below:

0-3one character from 0 (48₁₀) to 3 (51₁₀)

Character Class[0-9]

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[01]?

?matches at most one character from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]{2,4}

{2,4}matches between 2 and 4 characters from the set below:

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

,the literal , (44₁₀ / 54₈ / 2C₁₆)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Group 4([^;]{0,50})

Negated Character Class[^;]{0,50}

{0,50}matches between 0 and 50 characters outside the set below:

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Group 5(;|\) ?\.)

1st Alternative;

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

2nd Alternative\) ?\.

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

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25 tokens

( ?ibid\., *(([0-3]?[0-9]\.)?[01]?[0-9]\.[0-9]{2,4}), *([^;]{0,50}) *(;|\) ?\.))

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