regex101: ISBN-13

Pro

^start of line

Non-Capturing Group(?:ISBN(?:-13)?:? )?

?repeats the group contents below at most once:

ISBNthe literal text ISBN (case sensitive)

Non-Capturing Group(?:-13)?

?repeats the group contents below at most once:

-13the literal text -13

:?optionally matches the literal : (58₁₀ / 72₈ / 3A₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Group gs1(?<gs1>\d{3})

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

Non-Capturing Group(?:(?<number>\d{9})|(?=[\d -]{14}$)[ -](?<registrationGroup>\d{1,5})[ -](?<registrant>\d{1,7})[ -](?<publication>\d{1,6})[ -])

1st Alternative(?<number>\d{9})

Group number(?<number>\d{9})

\d{9}a digit, repeated exactly 9 times

2nd Alternative(?=[\d -]{14}$)[ -](?<registrationGroup>\d{1,5})[ -](?<registrant>\d{1,7})[ -](?<publication>\d{1,6})[ -]

Positive Lookahead(?=[\d -]{14}$)

Character Class[\d -]{14}

{14}matches exactly 14 characters from the set below:

\da digit

the literal (32₁₀ / 40₈ / 20₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

$end of line

Character Class[ -]

the literal (32₁₀ / 40₈ / 20₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group registrationGroup(?<registrationGroup>\d{1,5})

\d{1,5}a digit, repeated between 1 and 5 times

Character Class[ -]

the literal (32₁₀ / 40₈ / 20₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group registrant(?<registrant>\d{1,7})

\d{1,7}a digit, repeated between 1 and 7 times

Character Class[ -]

the literal (32₁₀ / 40₈ / 20₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group publication(?<publication>\d{1,6})

\d{1,6}a digit, repeated between 1 and 6 times

Character Class[ -]

the literal (32₁₀ / 40₈ / 20₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group checkDigit(?<checkDigit>\d)

\da digit

$end of line

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

26 tokens

Regular Expression

^(?:ISBN(?:-13)?:? )?(?<gs1>\d{3})(?:(?<number>\d{9})|(?=[\d -]{14}$)[ -](?<registrationGroup>\d{1,5})[ -](?<registrant>\d{1,7})[ -](?<publication>\d{1,6})[ -])(?<checkDigit>\d)$

New

9781861978769
97818619787659
978186197879
978-1-86197-876-9
978-1-86197-87-9
978-1-86197-8765-9
978-186197-876-9
978-186197-8-76-9