regex101: PCRE (Legacy) Match Workspace

Explanation

Pro

Non-Capturing Group(?:(?:[\s-]*\d{2}-\d{2}-\d{4})+)?

?repeats the group contents below at most once:

Non-Capturing Group(?:[\s-]*\d{2}-\d{2}-\d{4})+

+repeats the group contents below at least once:

Character Class[\s-]*

*matches any number of characters from the set below:

\sany whitespace character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a digit, repeated exactly 2 times

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a digit, repeated exactly 2 times

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{4}a digit, repeated exactly 4 times

\s*any whitespace character, repeated any number of times

Group amount(?<amount>-*\d+,\d+)

-*the literal - (45₁₀ / 55₈ / 2D₁₆) , repeated any number of times

\d+a digit, repeated at least once

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d+a digit, repeated at least once

\s*any whitespace character, repeated any number of times

$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

Quick Reference

25 tokens

Regular Expression

(?:(?:[\s-]*\d{2}-\d{2}-\d{4})+)?\s*(?<amount>-*\d+,\d+)\s*$

 31-12-2019 Forfait 01-01-2019 - 31-12-2019 -29,00  
31-12-2019Forfait 01-01-2019 - 31-12-201950,00
31-12-2019Mercedes-500,00
31-12-2019Client10 700,00
31-12-2019Comptoir17 50,00

// edge cases
31-12-2019Client 10700,00
31-12-2019Client 10-700,00
31-12-2019Client 10 700,00
31-12-2019Comptoir 1750,00
31-12-2019Comptoir 17-50,00
31-12-2019Comptoir 17 50,00

// versions related to [https://regex101.com/r/7TdghZ/1] ...

^\s*(?<date>\d{2}-\d{2}-\d{4})\s*(?<text>[^\s-]+(?:(?:[\s-]*\d{2}-\d{2}-\d{4})+)?)\s*(?<amount>-*\d+,\d+)

(?<date>\d{2}-\d{2}-\d{4})\s*(?<text>[^\s-]+(?:(?:[\s-]*\d{2}-\d{2}-\d{4})+)?)\s*(?<amount>-*\d+,\d+)\s*$

// final version
(?:(?:[\s-]*\d{2}-\d{2}-\d{4})+)?\s*(?<amount>-*\d+,\d+)\s*$