Regular Expressions 101

Group 1(\d+\.\d+\.\d+\.\d+(?:\.\d+)?)

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, 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 at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

Non-Capturing Group(?:(?=\.)|-(\d+)|$)

1st Alternative(?=\.)

Positive Lookahead(?=\.)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd Alternative-(\d+)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 2(\d+)

\d+a digit, repeated at least once

3rd Alternative$

$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

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Search reference

Regular Expression

(\d+\.\d+\.\d+\.\d+(?:\.\d+)?)(?:(?=\.)|-(\d+)|$)

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