Regular Expressions 101

Negative Lookbehind(?<!\\)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

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

*repeats the group contents below any number of times:

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Group 1(<@!?\d+>)

<@the literal text <@

!?optionally matches the literal ! (33₁₀ / 41₈ / 21₁₆)

\d+a digit, repeated at least once

>the literal > (62₁₀ / 76₈ / 3E₁₆)

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.

Search reference

Regular Expression

(?<!\\)(?:\\\\)*(<@!?\d+>)

New

Valid Input String: \\<@!123>
Matches: <@!123>

Invalid Input String: \\\<@!123>
Matches: none

Valid Input String: <@123>test<@456>
Matches: <@123>, <@456>

Invalid Input String: \<@123>test\\\<@456>
Matches: none

Regular Expression

Substitution