Regular Expressions 101

Explanation
Pro

Character Class[-+]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

\ba Unicode word boundary

Negative Lookahead(?!\d+(?:[,.]\d+)?%)

\d+a Unicode decimal digit, repeated at least once

Non-Capturing Group(?:[,.]\d+)?

?repeats the group contents below at most once:

Character Class[,.]

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a Unicode decimal digit, repeated at least once

%the literal % (37₁₀ / 45₈ / 25₁₆)

\d+a Unicode decimal digit, repeated at least once

Non-Capturing Group(?:[.,]\d+)?

?repeats the group contents below at most once:

Character Class[.,]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d+a Unicode decimal digit, 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

Detailed match information will be displayed here automatically.

25 tokens

[-+]?\b(?!\d+(?:[,.]\d+)?%)\d+(?:[.,]\d+)?

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TVA (20.00%) euros : 1,68
Prix TTC euros : 10,10
Prix HT euros 8,42

TVA (20.00%) euros : 1,68
Prix TTC euros : 10,10
Prix HT euros 8,42