regex101: JavaScript 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)

Negative Lookahead(?!$)

$end of line

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

?repeats the group contents below at most once:

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-zA-Z]*

*matches any number of characters from the set below:

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

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Non-Capturing Group(?:\.[a-zA-Z]{2,6})?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-zA-Z]{2,6}

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

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

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Non-Capturing Group(?:(?:\d{1,3}\.){3}\d{1,3})?

?repeats the group contents below at most once:

Non-Capturing Group(?:\d{1,3}\.){3}

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

\d{1,3}a digit, repeated between 1 and 3 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,3}a digit, repeated between 1 and 3 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

26 tokens

Regular Expression

^(?:https?:\/\/)(?!$)(?:www\.)?[a-zA-Z]*(?:\.[a-zA-Z]{2,6})?(?:(?:\d{1,3}\.){3}\d{1,3})?$

google.com
https://google.com
https:google.com
www.cool.com.au
https://asdsds.Com
http://a
https://
  <---- Pass **BUT SHOULD FAIL**
http://10.10.10.00
http://www.cool.com
https://123123.asd
http://www.cool.com.au/ersdfs
http://www.cool.com.au/ersdfs?dfd=dfgd@s=1
http://www.cool.com:81/index.html

Extraction

google.com
https://google.com
https:google.com
www.cool.com.au
https://asdsds.Com
http://a
https://
  <---- Pass **BUT SHOULD FAIL**
http://10.10.10.00
http://www.cool.com
https://123123.asd
http://www.cool.com.au/ersdfs
http://www.cool.com.au/ersdfs?dfd=dfgd@s=1
http://www.cool.com:81/index.html