Regular Expressions 101

Explanation

Pro

^start of line

Negative Lookahead(?!0+(\.0+)?$)

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

Group 1(\.0+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

$end of line

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

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

Non-Capturing Group(?:\.\d{1,2})?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,2}a Unicode decimal digit, repeated between 1 and 2 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

Detailed match information will be displayed here automatically.

25 tokens

^(?!0+(\.0+)?$)-?\d+(?:\.\d{1,2})?$

New

1
72.25
568
7898578
-1
-3233443
0.01
-0.14
0.12

Disallowed

0
1.235
-5.658
0.0
0.00