regex101: JavaScript Match Workspace

Pro

\ban ASCII word boundary

Group 1(1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])

1st Alternative1?[0-9]{1,2}

1?optionally matches the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

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

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 Alternative25[0-5]

25the literal text 25

Character Class[0-5]

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2(1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])

1st Alternative1?[0-9]{1,2}

1?optionally matches the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

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

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 Alternative25[0-5]

25the literal text 25

Character Class[0-5]

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 3(1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])

1st Alternative1?[0-9]{1,2}

1?optionally matches the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

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

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 Alternative25[0-5]

25the literal text 25

Character Class[0-5]

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 4(1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])

1st Alternative1?[0-9]{1,2}

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

3rd Alternative25[0-5]

\ban ASCII word boundary

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

26 tokens

Regular Expression

\b(1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])\.(1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])\.(1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])\.(1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])\b

New

192.168.1.1
127.0.0.1
256.548.0.1
255.255.255.0
192.168.123.1
0.1
123.4
19864.684.1
123.123.123
123.123.260.123