regex101: PCRE (Legacy) Match Workspace

^start of line

-?optionally matches the literal - (45₁₀ / 55₈ / 2D₁₆)

Positive Lookahead(?=\d{1,15}(?:[.,]0+)?0*$|(?:(?=.{1,16}0*$)(?:\d+[.,]\d+)))

1st Alternative\d{1,15}(?:[.,]0+)?0*$

\d{1,15}a digit, repeated between 1 and 15 times

Non-Capturing Group(?:[.,]0+)?

?repeats the group contents below at most once:

Character Class[.,]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

0+the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated at least once

0*the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated any number of times

$end of line

2nd Alternative(?:(?=.{1,16}0*$)(?:\d+[.,]\d+))

Non-Capturing Group(?:(?=.{1,16}0*$)(?:\d+[.,]\d+))

Positive Lookahead(?=.{1,16}0*$)

.{1,16}any character (except for line terminators), repeated between 1 and 16 times

0*the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated any number of times

$end of line

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

\d+a digit, repeated at least once

Character Class[.,]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d+a digit, repeated at least once

.+any character (except for line terminators), repeated at least once

$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

Search reference

Regular Expression

^-?(?=\d{1,15}(?:[.,]0+)?0*$|(?:(?=.{1,16}0*$)(?:\d+[.,]\d+))).+$

New

// 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

// FAIL
-1234567890123456
-12345678901234.56
12345678901234.56
123456789012345.60
1.234567890123456
12.34567890123456
123456789012340.6
123456789012300.67
123456789012300000000000.67
10000000000010000000001000010000000001.22

Regular Expressions 101

Regular Expression

Extraction