Regular Expressions 101

\ban ASCII word boundary

Non-Capturing Group(?:(?:192\.168|172(?:\.(?:1[789]|2\d|3[01])))(?:\.\d{1,3}){2}|10(?:\.\d{1,3}){3})

1st Alternative(?:192\.168|172(?:\.(?:1[789]|2\d|3[01])))(?:\.\d{1,3}){2}

Non-Capturing Group(?:192\.168|172(?:\.(?:1[789]|2\d|3[01])))

1st Alternative192\.168

192the literal text 192

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

168the literal text 168

2nd Alternative172(?:\.(?:1[789]|2\d|3[01]))

172the literal text 172

Non-Capturing Group(?:\.(?:1[789]|2\d|3[01]))

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:1[789]|2\d|3[01])

1st Alternative1[789]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[789]

7the literal 7 (55₁₀ / 67₈ / 37₁₆)

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

2nd Alternative2\d

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

\da digit

3rd Alternative3[01]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Non-Capturing Group(?:\.\d{1,3}){2}

{2}repeats the group contents below exactly 2 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

2nd Alternative10(?:\.\d{1,3}){3}

10the literal text 10

Non-Capturing Group(?:\.\d{1,3}){3}

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

\ban ASCII word boundary

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

\b(?:(?:192\.168|172(?:\.(?:1[789]|2\d|3[01])))(?:\.\d{1,3}){2}|10(?:\.\d{1,3}){3})\b

New

172.17.255.255
172.31.1.123
172.16.1.123
192.168.0.1

172.16.1.1
10.0.0.110