regex101: .NET 10.0 (C#) Match Workspace

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

s modifier: single line. Allows a dot to match line terminators

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

.*any Unicode character, repeated any number of times

Invoicethe literal text Invoice (case insensitive)

Character Class[\s_:.]+

+matches at least one character from the set below:

\sa Unicode whitespace character

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group anr(?<anr>[^\s_]+)

Negated Character Class[^\s_]+

+matches at least one character outside the set below:

\sa Unicode whitespace character

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

.+any Unicode character, repeated at least once

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

25 tokens

Regular Expression

(?si).*Invoice[\s_:.]+(?<anr>[^\s_]+).+

Payer:_xxxxxxx
Waybill Invoice_IN280625-3/4 Nimetus_EAN  
Invoice issuer: John
Selle Invoice tasumisel palume m lisada Kesolev Invoice on poolte
vahel Invoice mittetähtaegsel tasumisel on müüjal õigus nõuda viivist 0,1% tasumata summalt päevas.
Kuni Invoice  payment sumiseni k

Substitution

Payer:_xxxxxxx
Waybill Invoice_IN280625-3/4 Nimetus_EAN  
Invoice issuer: John
Selle Invoice tasumisel palume m lisada Kesolev Invoice on poolte
vahel Invoice mittetähtaegsel tasumisel on müüjal õigus nõuda viivist 0,1% tasumata summalt päevas.
Kuni Invoice  payment sumiseni k