regex101: Python Match Workspace

^start of line

Negative Lookahead(?!(?:.*?[1-9]){15,})

Non-Capturing Group(?:.*?[1-9]){15,}

{15,}repeats the group contents below at least 15 times:

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

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Group 1([-+]?\s*\d+[\.\,]?\d*?)

Character Class[-+]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

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

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

Character Class[\.\,]?

?matches at most one character from the set below:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d*?a Unicode decimal digit, 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

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

Search reference

Regular Expression

^(?!(?:.*?[1-9]){15,})([-+]?\s*\d+[\.\,]?\d*?)$

New

// 15 sig figs, should pass:
0
0.00
1
-1
1.23456789012345
10.2345678901234
12.3456789012345
-123.4
-12.34
-1,33
-1.33
-123456789012345
-1234567890123450
-12345678901234.50
12345678901234.50
123456789012345.00

// should fail:
-1234567890123456
-12345678901234.56
12345678901234.56
123456789012345.60
1.234567890123456
12.34567890123456
123456789012340.6
123456789012300.67
123456789012300000000000.67
10000000000010000000001000010000000001.22