regex101: IP Address

Pro

^start of line

Group 1((?:[01][0-9]{0,2}|(?:2(?:5[0-5]{0,1}|[0-4][0-9]{0,1}|[6-9]{0,1}))|[3-9][0-9]{0,1})\.){3}

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

Non-Capturing Group(?:[01][0-9]{0,2}|(?:2(?:5[0-5]{0,1}|[0-4][0-9]{0,1}|[6-9]{0,1}))|[3-9][0-9]{0,1})

1st Alternative[01][0-9]{0,2}

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

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

{0,2}matches between 0 and 2 characters from the set below:

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

2nd Alternative(?:2(?:5[0-5]{0,1}|[0-4][0-9]{0,1}|[6-9]{0,1}))

Non-Capturing Group(?:2(?:5[0-5]{0,1}|[0-4][0-9]{0,1}|[6-9]{0,1}))

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Non-Capturing Group(?:5[0-5]{0,1}|[0-4][0-9]{0,1}|[6-9]{0,1})

1st Alternative5[0-5]{0,1}

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

Character Class[0-5]{0,1}

{0,1}matches at most one character from the set below:

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

2nd Alternative[0-4][0-9]{0,1}

Character Class[0-4]

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

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

{0,1}matches at most one character from the set below:

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

3rd Alternative[6-9]{0,1}

Character Class[6-9]{0,1}

{0,1}matches at most one character from the set below:

6-9one character from 6 (54₁₀) to 9 (57₁₀)

3rd Alternative[3-9][0-9]{0,1}

Character Class[3-9]

3-9one character from 3 (51₁₀) to 9 (57₁₀)

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

{0,1}matches at most one character from the set below:

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:[01][0-9]{0,2}|(?:2(?:5[0-5]{0,1}|[0-4][0-9]{0,1}|[6-9]{0,1}))|[3-9][0-9]{0,1})

1st Alternative[01][0-9]{0,2}

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

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

{0,2}matches between 0 and 2 characters from the set below:

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

2nd Alternative(?:2(?:5[0-5]{0,1}|[0-4][0-9]{0,1}|[6-9]{0,1}))

Non-Capturing Group(?:2(?:5[0-5]{0,1}|[0-4][0-9]{0,1}|[6-9]{0,1}))

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Non-Capturing Group(?:5[0-5]{0,1}|[0-4][0-9]{0,1}|[6-9]{0,1})

1st Alternative5[0-5]{0,1}

2nd Alternative[0-4][0-9]{0,1}

3rd Alternative[6-9]{0,1}

3rd Alternative[3-9][0-9]{0,1}

$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

27 tokens

Regular Expression

^((?:[01][0-9]{0,2}|(?:2(?:5[0-5]{0,1}|[0-4][0-9]{0,1}|[6-9]{0,1}))|[3-9][0-9]{0,1})\.){3}(?:[01][0-9]{0,2}|(?:2(?:5[0-5]{0,1}|[0-4][0-9]{0,1}|[6-9]{0,1}))|[3-9][0-9]{0,1})$

000.12.12.034
01.1.1.1
121.234.12.12
23.45.12.56
000.12.234.23.23
666.666.23.23
.213.123.23.32
23.45.22.32.
I.Am.not.an.ip
1.1.1.1
0.0.0.0
255.2.2.255
256.0.0.33
199.200.0.22
000
111
0
00
1
00
11
99
90
2
3
4
292
999
255
266
299
256
199
244

000.12.12.034
121.234.12.12
23.45.12.56
00.12.123.123123.123
122.23
Hello.IP

Extraction

000.12.12.034
01.1.1.1
121.234.12.12
23.45.12.56
000.12.234.23.23
666.666.23.23
.213.123.23.32
23.45.22.32.
I.Am.not.an.ip
1.1.1.1
0.0.0.0
255.2.2.255
256.0.0.33
199.200.0.22
000
111
0
00
1
00
11
99
90
2
3
4
292
999
255
266
299
256
199
244

000.12.12.034
121.234.12.12
23.45.12.56
00.12.123.123123.123
122.23
Hello.IP