Regular Expressions 101

1st Alternative\.\d+\b(*SKIP)(*FAIL)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

\ban ASCII word boundary

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

(*FAIL)forces the current match attempt to fail at this position

2nd Alternative\d{1,3}(?=(?:\d{3})+(?:\.\d|(?!\S)))

\d{1,3}a digit, repeated between 1 and 3 times

Positive Lookahead(?=(?:\d{3})+(?:\.\d|(?!\S)))

Non-Capturing Group(?:\d{3})+

+repeats the group contents below at least once:

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

Non-Capturing Group(?:\.\d|(?!\S))

1st Alternative\.\d

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\da digit

2nd Alternative(?!\S)

Negative Lookahead(?!\S)

\Sany non-whitespace character

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.

Search reference

Regular Expression

\.\d+\b(*SKIP)(*FAIL)|\d{1,3}(?=(?:\d{3})+(?:\.\d|(?!\S)))

1829383839.2937484
1829383839

test 1829383839 test
test 1829383839.2937484 test