Regular Expressions 101

https://the literal text https:// (case sensitive)

Group 1((?:[a-z0-9-]+\.)*)

Non-Capturing Group(?:[a-z0-9-]+\.)*

*repeats the group contents below any number of times:

Character Class[a-z0-9-]+

+matches at least one character from the set below:

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2([a-z0-9-]+\.[a-z]+)

Character Class[a-z0-9-]+

+matches at least one character from the set below:

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

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

-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)

Group 3($|\s|\:\d{1,5})

1st Alternative$

$end of string, or before its final line terminator

2nd Alternative\s

\sa Unicode whitespace character

3rd Alternative\:\d{1,5}

\:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{1,5}a Unicode decimal digit, repeated between 1 and 5 times

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

https://((?:[a-z0-9-]+\.)*)([a-z0-9-]+\.[a-z]+)($|\s|\:\d{1,5})

New

# Valid
https://host
https://some.xyz
https://some.other.xyz
https://some.other.one.xyz
https://my.abc.example-domain.xyz:443
https://my.abc.example-domain.xyz

# Invalid
https://my.abc.example-domain.xyz
https://my.abc.ex|am|ple-|dom|ain|.xyz:443
https://éhééé.fr
https://invalid domain.fr
https://invalid domain

Regular Expression

Substitution