regex101: IDN Domains and Subdomains

Pro

^start of line

Non-Capturing Group(?:[^:\/?#]+:)?

?repeats the group contents below at most once:

Negated Character Class[^:\/?#]+

+matches at least one character outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Non-Capturing Group(?:(?:\/\/)?(?:[^\s\/?#]+\.)+[^\s\/?#]+(?:\/[^\s"#]*)?)

Non-Capturing Group(?:\/\/)?

?repeats the group contents below at most once:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:[^\s\/?#]+\.)+

+repeats the group contents below at least once:

Negated Character Class[^\s\/?#]+

+matches at least one character outside the set below:

\sany whitespace character

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negated Character Class[^\s\/?#]+

+matches at least one character outside the set below:

\sany whitespace character

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

Non-Capturing Group(?:\/[^\s"#]*)?

?repeats the group contents below at most once:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Negated Character Class[^\s"#]*

*matches any number of characters outside the set below:

\sany whitespace character

"the literal " (34₁₀ / 42₈ / 22₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

$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

25 tokens

Regular Expression

^(?:[^:\/?#]+:)?(?:(?:\/\/)?(?:[^\s\/?#]+\.)+[^\s\/?#]+(?:\/[^\s"#]*)?)$

New

xn--4gbrim.xn--wgbh1c
中文域名.中国
😄❤️🌟.ws
example.com
xn--mgbah1a3hjkrd.com
🍕🏞️🎵.online
技术论坛.中国
www.nck.gg
www.www2.test.com
xn--80aaag1a8aj.xn
商业网站.中国

xn--4gbrim.xn--wgbh1c
中文域名.中国
😄❤️🌟.ws
example.com
xn--mgbah1a3hjkrd.com
🍕🏞️🎵.online
技术论坛.中国
www.nck.gg
www.www2.test.com
xn--80aaag1a8aj.xn
商业网站.中国