Regular Expressions 101

1st Alternative^(?:https?:\/\/)(?:www\.)?([^\/\s]+)$

^start of line

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

httpthe literal text http (case sensitive)

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:www\.)?

?repeats the group contents below at most once:

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 1([^\/\s]+)

Negated Character Class[^\/\s]+

+matches at least one character outside the set below:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\sany whitespace character

$end of line

2nd Alternative^(?:https?:\/\/)(?:www\.)?([^\/\s]+)(?:.*)$

^start of line

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

httpthe literal text http (case sensitive)

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:www\.)?

?repeats the group contents below at most once:

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2([^\/\s]+)

Negated Character Class[^\/\s]+

+matches at least one character outside the set below:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\sany whitespace character

Non-Capturing Group(?:.*)

.*any character (except for line terminators), repeated any number of times

$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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?:https?:\/\/)(?:www\.)?([^\/\s]+)$|^(?:https?:\/\/)(?:www\.)?([^\/\s]+)(?:.*)$

New

https://domain.com
https://subdomain.domain.com
https://www.sub.sub.subdomain.domain.com
http://sub.masterdomain.com.au
https://four.submains.new.domain.luxury.co.uk
https://www.globo.us/games/tap-zap-boom/
https://www.test.com/games/socce/index.html
https://google.com.br/services/index.php

Regular Expression

Substitution