regex101: IpAddress

^start of line

Non-Capturing Group(?:2[0-4][0-9]|25[0-5]|1?[0-9]?[0-9])

1st 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)

2nd Alternative25[0-5]

25the literal text 25

Character Class[0-5]

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

3rd Alternative1?[0-9]?[0-9]

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

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)

Character Class[.]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:2[0-4][0-9]|25[0-5]|1?[0-9]?[0-9])

1st 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)

2nd Alternative25[0-5]

25the literal text 25

Character Class[0-5]

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

3rd Alternative1?[0-9]?[0-9]

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

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)

Character Class[.]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:2[0-4][0-9]|25[0-5]|1?[0-9]?[0-9])

1st 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)

2nd Alternative25[0-5]

25the literal text 25

Character Class[0-5]

3rd Alternative1?[0-9]?[0-9]

Character Class[.]

Non-Capturing Group(?:2[0-4][0-9]|25[0-5]|1?[0-9]?[0-9])

$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

^(?:2[0-4][0-9]|25[0-5]|1?[0-9]?[0-9])[.](?:2[0-4][0-9]|25[0-5]|1?[0-9]?[0-9])[.](?:2[0-4][0-9]|25[0-5]|1?[0-9]?[0-9])[.](?:2[0-4][0-9]|25[0-5]|1?[0-9]?[0-9])$

New

0.0.0.0
192.168.1.1
127.0.0.1
255.255.255.255
9.9.9.253
1.1.1.1


256.0.0.0
0.256.0.0
0.0.256.0
0.0.0.256
.0.0.0.0
0.0.0.0.
a.a.a.a
-1.-1.-1.-1
256.256.256.256
^(\b(?:2[0-4][0-9]|25[0-5]|1?[0-9]?[0-9])\b\.\b(?:2[0-4][0-9]|25[0-5]|1?[0-9]?[0-9])\b\.\b(?:2[0-4][0-9]|25[0-5]|1?[0-9]?[0-9])\b\.\b(?:2[0-4][0-9]|25[0-5]|1?[0-9]?[0-9])\b)$

1
1.
1.1
1.1
1.1.
1.1.1
1.1.1.
1.1.1.1
1.1.1.1.
1.1.1.1.1
20
20.
20.20
20.20.
20.20.20
20.20.20.
20.20.20.20
20.20.20.20.
20.20.20.20.20
300
300.
300.300
300.300.
300.300.300
300.300.300.
300.300.300.300
300.300.300.300.
300.300.300.300.300
4000
4000.
4000.4000
4000.4000.
4000.4000.4000
4000.4000.4000.
4000.4000.4000.4000
4000.4000.4000.4000.
4000.4000.4000.4000.4000
amiraizat124@gmail.com
ak</';
1,1,1,1

Regular Expressions 101

Regular Expression

Substitution