regex101: “Defanged” URL or IPv4 address

^start of line

Group 1(((h..ps?|f.p):\/\/)?(?:([\w\-\.])+(\[?\.\]?)([\w]){2,4}|(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\[?\.\]?){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)))*

*repeats the group contents below any number of times:

Group 2((h..ps?|f.p):\/\/)?

?repeats the group contents below at most once:

Group 3(h..ps?|f.p)

1st Alternativeh..ps?

hthe literal h (104₁₀ / 150₈ / 68₁₆) (case sensitive)

.any character (except for line terminators)

pthe literal p (112₁₀ / 160₈ / 70₁₆) (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

2nd Alternativef.p

fthe literal f (102₁₀ / 146₈ / 66₁₆) (case sensitive)

.any character (except for line terminators)

pthe literal p (112₁₀ / 160₈ / 70₁₆) (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:([\w\-\.])+(\[?\.\]?)([\w]){2,4}|(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\[?\.\]?){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?))

1st Alternative([\w\-\.])+(\[?\.\]?)([\w]){2,4}

Group 4([\w\-\.])+

+repeats the group contents below at least once:

Character Class[\w\-\.]

\wany word character

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 5(\[?\.\]?)

\[?optionally matches the literal [ (91₁₀ / 133₈ / 5B₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\]?optionally matches the literal ] (93₁₀ / 135₈ / 5D₁₆)

Group 6([\w]){2,4}

{2,4}repeats the group contents below between 2 and 4 times:

Character Class[\w]

\wany word character

2nd Alternative(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\[?\.\]?){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)

Non-Capturing Group(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\[?\.\]?){3}

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

Non-Capturing Group(?:25[0-5]|2[0-4]\d|[01]?\d\d?)

1st Alternative25[0-5]

25the literal text 25

Character Class[0-5]

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

2nd 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

3rd Alternative[01]?\d\d?

Character Class[01]?

?matches at most one character from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\da digit

\d?optionally matches a digit

\[?optionally matches the literal [ (91₁₀ / 133₈ / 5B₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\]?optionally matches the literal ] (93₁₀ / 135₈ / 5D₁₆)

Non-Capturing Group(?:25[0-5]|2[0-4]\d|[01]?\d\d?)

1st Alternative25[0-5]

25the literal text 25

Character Class[0-5]

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

2nd Alternative2[0-4]\d

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-4]

\da digit

3rd Alternative[01]?\d\d?

Group 7([\w\/+=%&_\.~?\-]*)

$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

^(((h..ps?|f.p):\/\/)?(?:([\w\-\.])+(\[?\.\]?)([\w]){2,4}|(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\[?\.\]?){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)))*([\w\/+=%&_\.~?\-]*)$

Test String
New

www[.]domain[.]com
www.domain.com
hxxp://www[.]domain[.]com

192.168.8.1/folder/file.html

192.168.1[.]1
192.168.1[.]1/folder/file.html
192[.]168[.]1[.]1/folder/file.html
hxxp://www[.]domain[.]com/folder/file.html

Regular Expression

Test StringNew

Test String
New