regex101: Validate a comma separated list of IPv4 addresses, CIDRs, or IPv4 Ranges like 1.1.1.1-1.1.1.10

^start of line

Non-Capturing Group(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\/(?:3[0-2]|[12]*\d)){0,1}[,|-])*

*repeats the group contents below any number of times:

Non-Capturing Group(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}

{3}repeats the group contents below exactly 3 times:

Non-Capturing Group(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)

1st Alternative25[0-5]

25the literal text 25

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

2nd Alternative2[0-4][0-9]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-4]

0-4one character from 0 (48₁₀) to 4 (52₁₀)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

3rd Alternative[01]?[0-9][0-9]?

Character Class[01]?

?matches at most one character from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Character Class[0-9]?

?matches at most one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)

1st Alternative25[0-5]

25the literal text 25

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

2nd Alternative2[0-4][0-9]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-4]

0-4one character from 0 (48₁₀) to 4 (52₁₀)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

3rd Alternative[01]?[0-9][0-9]?

Character Class[01]?

?matches at most one character from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Character Class[0-9]?

?matches at most one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Group 1(\/(?:3[0-2]|[12]*\d)){0,1}

{0,1}repeats the group contents below at most once:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:3[0-2]|[12]*\d)

1st Alternative3[0-2]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[0-2]

2nd Alternative[12]*\d

Character Class[,|-]

Non-Capturing Group(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}

Non-Capturing Group(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)

Group 2(\/(?:3[0-2]|[12]*\d)){0,1}

$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

Search reference

Regular Expression

^(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\/(?:3[0-2]|[12]*\d)){0,1}[,|-])*(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\/(?:3[0-2]|[12]*\d)){0,1}$

Unit Tests

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