Regular Expressions 101

Group 1([0-9]{2,6})

Character Class[0-9]{2,6}

{2,6}matches between 2 and 6 characters from the set below:

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

Character Class[\s\D]*

*matches any number of characters from the set below:

\sany whitespace character

\Dany character that's not a digit

Group 2([0-9]{1,6})

Character Class[0-9]{1,6}

{1,6}matches between 1 and 6 characters from the set below:

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

Character Class[\s\D]*

*matches any number of characters from the set below:

\sany whitespace character

\Dany character that's not a digit

Group 3((20){0,1}([0-9]{2}))

Group 4(20){0,1}

{0,1}repeats the group contents below at most once:

20the literal text 20

Group 5([0-9]{2})

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

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

$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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

([0-9]{2,6})[\s\D]*([0-9]{1,6})[\s\D]*((20){0,1}([0-9]{2}))$

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pagamento fattura 003235 2071/2022
pagamento fattura 003235/cli 2071/2022
pagamento fattura 003235-cli 2071-2022
pagamento fattura 003235 2071-2022
pagamento fattura 003235 cli 2071 2022
pagamento fattura 003235 2071 2022
pagamento fattura 003235 2071 del 20/12/2022
pagamento fattura cliente 003235 nr. 2071 del 20/12/2022
pagamento fattura cliente 003235 nr. 2071 del 20/12/22