Regular Expressions 101

Pro

Group 1((?<!\d)4[0-9]{9}\b)

Negative Lookbehind(?<!\d)

\da digit

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

Character Class[0-9]{9}

{9}matches exactly 9 characters from the set below:

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

\ban ASCII word boundary

Negative Lookahead(?!.*\1)

.*any character (except for line terminators), repeated any number of times

\1the text saved by group 1

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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

((?<!\d)4[0-9]{9}\b)(?!.*\1)

New

DISCRIMINAÇÃO DOS SERVIÇOS
00000001 - REFERENTE AOS SERVICOS PRESTADOS NO PERIODO DE 2022-08-16 A 2022-09-15 - NRo. PEDIDO DE COMPRA:
4254687815 - NRo.  Compra 4254687815

Extraction

DISCRIMINAÇÃO DOS SERVIÇOS
00000001 - REFERENTE AOS SERVICOS PRESTADOS NO PERIODO DE 2022-08-16 A 2022-09-15 - NRo. PEDIDO DE COMPRA:
4254687815 - NRo.  Compra 4254687815