Regular Expressions 101

Explanation

Pro

^start of line

Non-Capturing Group(?:\w+:\/\/)?

?repeats the group contents below at most once:

\w+any word character, repeated at least once

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:[^\/.\n]+\.)?

?repeats the group contents below at most once:

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

+matches at least one character outside the set below:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

hellothe literal text hello (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

netthe literal text net (case sensitive)

Non-Capturing Group(?:\/.*)?

?repeats the group contents below at most once:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.*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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

^(?:\w+:\/\/)?(?:[^\/.\n]+\.)?hello\.net(?:\/.*)?$

New

http://hello.net
https://hello.net
http://www.hello.net
https://www.hello.net
http://domain.hello.net
https://solutions.hello.net
hello.net
www.hello.net

hello.net.domain.com

Extraction

http://hello.net
https://hello.net
http://www.hello.net
https://www.hello.net
http://domain.hello.net
https://solutions.hello.net
hello.net
www.hello.net

hello.net.domain.com