regex101: PCRE (Legacy) Match Workspace

Pro

^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(?:w{3}\.)?

?repeats the group contents below at most once:

w{3}the literal w (119₁₀ / 167₈ / 77₁₆) (case sensitive), repeated exactly 3 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

Group 1([^.\r\n\/]+\.)

Negated Character Class[^.\r\n\/]+

+matches at least one character outside the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2([^.\r\n\/]+\.[^.\r\n\/]{2,6}(?:\.[^.\r\n\/]{2,6})?)

Negated Character Class[^.\r\n\/]+

+matches at least one character outside the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negated Character Class[^.\r\n\/]{2,6}

{2,6}matches between 2 and 6 characters outside the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:\.[^.\r\n\/]{2,6})?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negated Character Class[^.\r\n\/]{2,6}

{2,6}matches between 2 and 6 characters outside the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

$end of line

Global pattern flags

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

25 tokens

Regular Expression

^(?:https?:\/\/)(?:w{3}\.)?.*?([^.\r\n\/]+\.)([^.\r\n\/]+\.[^.\r\n\/]{2,6}(?:\.[^.\r\n\/]{2,6})?).*$

New

http://www.answers.com/article/1194427/8-habits-of-extraordinarily-likeable-people
http://www.apple.com
https://www.cnn.com.au
http://www.downloads.news.com.au
https://ftp.android.co.nz
http://global.news.ca
https://www.apple.com/
https://ftp.android.co.nz/
http://global.news.ca/
https://www.apple.com/

Substitution

http://www.answers.com/article/1194427/8-habits-of-extraordinarily-likeable-people
http://www.apple.com
https://www.cnn.com.au
http://www.downloads.news.com.au
https://ftp.android.co.nz
http://global.news.ca
https://www.apple.com/
https://ftp.android.co.nz/
http://global.news.ca/
https://www.apple.com/