Regular Expressions 101

^start of line

Non-Capturing Group(?:ISBN(?:-10)?:? )?

?repeats the group contents below at most once:

ISBNthe literal text ISBN (case sensitive)

Non-Capturing Group(?:-10)?

?repeats the group contents below at most once:

-10the literal text -10

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

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:(?<number>\d{9})|(?=[\dX -]{13}$)(?<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(?=[\dX -]{13}$)(?<registrationGroup>\d{1,5})[ -](?<registrant>\d{1,7})[ -](?<publication>\d{1,6})[ -]

Positive Lookahead(?=[\dX -]{13}$)

Character Class[\dX -]{13}

{13}matches exactly 13 characters from the set below:

\da digit

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

the literal (32₁₀ / 40₈ / 20₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

$end of line

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>[\dX])

Character Class[\dX]

\da digit

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

$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

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Search reference

Regular Expression

^(?:ISBN(?:-10)?:? )?(?:(?<number>\d{9})|(?=[\dX -]{13}$)(?<registrationGroup>\d{1,5})[ -](?<registrant>\d{1,7})[ -](?<publication>\d{1,6})[ -])(?<checkDigit>[\dX])$

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