Regular Expressions 101

Explanation

Pro

1st Alternative\b0+\.\d+(?:\.\d+)*

\ban ASCII word boundary

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

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

*repeats the group contents below any number of times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

2nd Alternative\B(?=(\d{3})+(?!\d))

\Bnot an ASCII word boundary

Positive Lookahead(?=(\d{3})+(?!\d))

Group 1(\d{3})+

+repeats the group contents below at least once:

\d{3}a digit, repeated exactly 3 times

Negative Lookahead(?!\d)

\da digit

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.

26 tokens

\b0+\.\d+(?:\.\d+)*|\B(?=(\d{3})+(?!\d))

1000
1000.03
1000.03+2300
1000.03+0.2300
1000.03+0000.000.2300

1000
1000.03
1000.03+2300
1000.03+0.2300
1000.03+0000.000.2300