Regular Expressions 101

Pro

Non-Capturing Group(?:([^@]*)@)?

?repeats the group contents below at most once:

Group 1([^@]*)

Negated Character Class[^@]*

*matches any number of characters outside the set below:

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Group 2(.\[.+\]|([^:]+))

1st Alternative.\[.+\]

.any character (except for line terminators)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

.+any character (except for line terminators), repeated at least once

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

2nd Alternative([^:]+)

Group 3([^:]+)

Negated Character Class[^:]+

+matches at least one character outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Non-Capturing Group(?:[:](\d+))?

?repeats the group contents below at most once:

Character Class[:]

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group 4(\d+)

\d+a digit, repeated at least once

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

Detailed match information will be displayed here automatically.

25 tokens

(?:([^@]*)@)?(.\[.+\]|([^:]+))(?:[:](\d+))?

test:222
https://aaa.com:333

https://www.aaa.com:333
aaa.bbb.cccc:8000

test:222
https://aaa.com:333

https://www.aaa.com:333
aaa.bbb.cccc:8000