Regular Expressions 101

Explanation

Pro

relay=the literal text relay= (case sensitive)

Group dest_domain(?<dest_domain>.*\w+)

.*any character (except for line terminators), repeated any number of times

\w+any word character, repeated at least once

Character Class[\.\s]+

+matches at least one character from the set below:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\sany whitespace character

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group dest_ip(?<dest_ip>[^\]]+)

Negated Character Class[^\]]+

+matches at least one character outside the set below:

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

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

relay=(?<dest_domain>.*\w+)[\.\s]+\[(?<dest_ip>[^\]]+)

New

relay=user@buttercup-games.com. [1.1.1.1]
relay=user@buttercup-games.com [1.1.1.1]
relay=user@buttercup-games.com.[1.1.1.1]

relay=user@buttercup-games.com. [1.1.1.1]
relay=user@buttercup-games.com [1.1.1.1]
relay=user@buttercup-games.com.[1.1.1.1]