Regular Expressions 101

Explanation

Pro

Positive Lookahead(?=.*\n)

.*any character (except for line terminators), repeated any number of times

\na line-feed (newline) character (ASCII 10)

Group 1(\d+)

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2(\d+)

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 3((\d+)\.)*

*repeats the group contents below any number of times:

Group 4(\d+)

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

(?=.*\n)(\d+)\.(\d+)\.((\d+)\.)*

1.2.
3.4.5.
5.6.7.10

1.2.
3.4.5.
5.6.7.10