Practice: Domains

A domain is made up of multiple parts.
It starts with a protocol (http:// or https://)
There can be optional subdomains, a common example is www.
Then there is the domain name itself.
And lastly the top-level domain (TLD) like .com or .de

For the task only consider these requirements:

Start with http:// or https://
Subdomains and domains can only contain letters, numbers and hyphens
The TLD can only contain letters and is at least 2 characters long

Hint:
Make sure to escape the dot \.

Task

Match all valid domains (Definition in description)

/ /

https://finn.pckrt.com
https://kai-goette.de
https://valid-domain.com
www://invalid-domain.com
also-not-valid
https://too-short-tld.c

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Regex Cheatsheet

Here you find every Regex character explained

Anchors

^ - Start of a string
$ - End of a string
\b - Word boundary
\B - Not word boundary

Quantifiers

? - Optional
+ - 1 or more times
* - 0 or more times
{n} - Exactly n times
{n,} - at least n times
{,m} - at most m times
{n,m} - Between n and m times

Character Classes

[abc] - Character Set
[^abc] - Not in character set
[a-z] - Range of characters
. - Any character except newline
\d - Digit
\D - Not a digit
\w - Word character
\W - Not a word character
\s - Whitespace
\S - Not whitespace

Groups

(abc) - Capturing group
(?:abc) - Non-capturing group
\1 - Group Reference

Lookarounds

(?=abc) - Positive lookahead
(?!abc) - Negative lookahead
(?<=abc) - Positive lookbehind
(?<!abc) - Negative lookbehind

Flags

g - Global
i - Case-insensitive
m - Multiline

Other Characters

\[Symbol] - Use a Regex Symbol as Text
| - Or