regex101: catch or match URL or URI

Definition Group(?(DEFINE) (?<protocol> (?<=^|[^a-z]) [a-z]+? : ) (?<domain> (?:[a-z\-]+\.)+[a-z\-]+ ) (?<ip> (?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?) ) (?<port> (?<!\s):\d+(?=\/|$|\s)) (?<pathquery>[A-Za-z\d\!\*\;\:\@\&\=\+\$\,\/\?\#\[\]\%\{\}\|\\\^\`\~]+) (?<url> (?&protocol) (?: (?:\/\/) (?: (?&domain) | (?&ip) ) (?&port)? )? (?&pathquery)) )

Group protocol(?<protocol> (?<=^|[^a-z]) [a-z]+? : )

Positive Lookbehind(?<=^|[^a-z])

1st Alternative^

^start of line

2nd Alternative[^a-z]

Negated Character Class[^a-z]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Character Class[a-z]+?

+?matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

: the literal text :

Group domain(?<domain> (?:[a-z\-]+\.)+[a-z\-]+ )

Non-Capturing Group(?:[a-z\-]+\.)+

+repeats the group contents below at least once:

Character Class[a-z\-]+

+matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z\-]+

+matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group ip(?<ip> (?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?) )

Non-Capturing Group(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}

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

Non-Capturing Group(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)

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][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)

3rd Alternative[01]?[0-9][0-9]?

Character Class[01]?

?matches at most one character from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

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

Character Class[0-9]?

?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(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)

1st Alternative25[0-5]

25the literal text 25

Character Class[0-5]

2nd Alternative2[0-4][0-9]

3rd Alternative[01]?[0-9][0-9]?

Group port(?<port> (?<!\s):\d+(?=\/|$|\s))

Group pathquery(?<pathquery>[A-Za-z\d\!\*\;\:\@\&\=\+\$\,\/\?\#\[\]\%\{\}\|\\\^\`\~]+)

Group url(?<url> (?&protocol) (?: (?:\/\/) (?: (?&domain) | (?&ip) ) (?&port)? )? (?&pathquery))

(?&url)calls group url as a subroutine

Global pattern flags

u modifier: unicode. Treats the pattern and subject as UTF-16

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Search reference

Regular Expression

(?(DEFINE)
    (?<protocol> (?<=^|[^a-z]) [a-z]+? : )
    (?<domain>   (?:[a-z\-]+\.)+[a-z\-]+ )
    (?<ip>       (?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?) )
    (?<port>     (?<!\s):\d+(?=\/|$|\s))
    (?<pathquery>[A-Za-z\d\!\*\(\)\;\:\@\&\=\+\$\,\/\?\#\[\]\%\{\}\|\\\^\`\~]+)
    (?<url>      (?&protocol) (?: (?:\/\/) (?: (?&domain) | (?&ip) ) (?&port)? )? (?&pathquery))
)
(?&url)

New

http://en.wikipedia.org/wiki/A#CITEREFSimpsonWeiner1989里面找      以上URL
下载地址magnet:?xt=urn:btih:65F16B126D8A656E4FC825DE204EBFAF04B070FC里面找  以上URL
magnet:
net:
以下URLhttps://en.wikipedia.org/wiki/A#CITEREFSimpsonWeiner1989里面找      以上URL
http://192.168.1.1/里面找
'https://en.wikipedia.org/wiki/A/////#CITEREFSimpsonWeiner1989'
http://192.168.1.1:80/ 里面找
以下URL
https://google.com/search?q=%E5%9F%9F%E5%90%8D#newwindow=1&q=%E5%9F%9F%E5%90%8D+%E5%AD%97%E7%AC%A6

http://en.wikipedia.org/wiki/A#CITEREFSimpsonWeiner1989
magnet:?xt=urn:btih:65F16B126D8A656E4FC825DE204EBFAF04B070FC
https://en.wikipedia.org/wiki/A#CITEREFSimpsonWeiner1989
http://192.168.1.1/
https://en.wikipedia.org/wiki/A/////#CITEREFSimpsonWeiner1989
http://192.168.1.1:80/
https://google.com/search?q=%E5%9F%9F%E5%90%8D#newwindow=1&q=%E5%9F%9F%E5%90%8D+%E5%AD%97%E7%AC%A6