Regular Expressions 101

Pro

(?i)applies the following effective flags to the remainder of the pattern: i

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

\ba Unicode word boundary

Invoicethe literal text Invoice (case insensitive)

Character Class[ _:.]+

+matches at least one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group anr(?<anr>[A-Z/-]*[0-9][A-Z0-9/-]*)

Character Class[A-Z/-]*

*matches any number of characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[0-9]

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

Character Class[A-Z0-9/-]*

*matches any number of characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

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

/the literal / (47₁₀ / 57₈ / 2F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negative Lookahead(?!\S)

\Sany character that is not Unicode whitespace

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25 tokens

(?i)\bInvoice[ _:.]+(?<anr>[A-Z/-]*[0-9][A-Z0-9/-]*)(?!\S)

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