Regular Expressions 101

Pro

^start of line

Group 1(2(?:2[4-9]|3[0-9]))

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Non-Capturing Group(?:2[4-9]|3[0-9])

1st Alternative2[4-9]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[4-9]

4-9one character from 4 (52₁₀) to 9 (57₁₀)

2nd Alternative3[0-9]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[0-9]

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2([0-2]?[0-9]?[0-9])

Character Class[0-2]?

?matches at most one character from the set below:

0-2one character from 0 (48₁₀) to 2 (50₁₀)

Character Class[0-9]?

?matches at most one character from the set below:

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

Character Class[0-9]

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 3([0-2]?[0-9]?[0-9])

Character Class[0-2]?

?matches at most one character from the set below:

0-2one character from 0 (48₁₀) to 2 (50₁₀)

Character Class[0-9]?

?matches at most one character from the set below:

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

Character Class[0-9]

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 4([0-2]?[0-9]?[0-9])

Character Class[0-2]?

?matches at most one character from the set below:

0-2one character from 0 (48₁₀) to 2 (50₁₀)

Character Class[0-9]?

?matches at most one character from the set below:

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

Character Class[0-9]

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

$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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^(2(?:2[4-9]|3[0-9]))\.([0-2]?[0-9]?[0-9])\.([0-2]?[0-9]?[0-9])\.([0-2]?[0-9]?[0-9])$

New

255.255.255.0
225.3.3.3
255.0.0.0
229.0.0.20
192.168.0.0
8.8.8.8
199.111.111.111

Extraction

255.255.255.0
225.3.3.3
255.0.0.0
229.0.0.20
192.168.0.0
8.8.8.8
199.111.111.111