Regular Expressions 101

Non-Capturing Group(?:0{0,2}\d|0?[1-9]\d|1\d\d|2[0-4]\d|25[0-5])

1st Alternative0{0,2}\d

0{0,2}the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated between 0 and 2 times

\da digit

2nd Alternative0?[1-9]\d

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\da digit

3rd Alternative1\d\d

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\da digit

4th Alternative2[0-4]\d

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-4]

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

\da digit

5th Alternative25[0-5]

25the literal text 25

Character Class[0-5]

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

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

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:0{0,2}\d|0?[1-9]\d|1\d\d|2[0-4]\d|25[0-5])

1st Alternative0{0,2}\d

0{0,2}the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated between 0 and 2 times

\da digit

2nd Alternative0?[1-9]\d

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\da digit

3rd Alternative1\d\d

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\da digit

4th Alternative2[0-4]\d

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-4]

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

\da digit

5th Alternative25[0-5]

25the literal text 25

Character Class[0-5]

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

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

(?:0{0,2}\d|0?[1-9]\d|1\d\d|2[0-4]\d|25[0-5])(?:\.(?:0{0,2}\d|0?[1-9]\d|1\d\d|2[0-4]\d|25[0-5])){3}

New

8.8.8.8
127.0.0.1
168.3.43.43
123456789
11.11.11.11
13.123.254.253
10.257.33.24
203.253.109.92

Regular Expression

Extraction