Regular Expressions 101

Explanation

Pro

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

Non-Capturing Group(?:[1-9]\d*(?:\.\d*)?|\.0*[1-9]\d*)

1st Alternative[1-9]\d*(?:\.\d*)?

Character Class[1-9]

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

\d*a digit, repeated any number of times

Non-Capturing Group(?:\.\d*)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d*a digit, repeated any number of times

2nd Alternative\.0*[1-9]\d*

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

Character Class[1-9]

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

\d*a digit, repeated any number of times

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

0*(?:[1-9]\d*(?:\.\d*)?|\.0*[1-9]\d*)

New

2.5, 0.12 ,222.22, 00.98, 0.23, 12.00, 0.004, .0012, 1.0, 2.
BUT NOT 
0, 0.0, 00.0, 0.00, 00.00, .0, 0.