Regular Expressions 101

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\s*a Unicode whitespace character, repeated any number of times

@+the literal @ (64₁₀ / 100₈ / 40₁₆) , repeated at least once

Non-Capturing Group(?:(?!<@+).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!<@+)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

@+the literal @ (64₁₀ / 100₈ / 40₁₆) , repeated at least once

.any Unicode character (except for line terminators)

>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

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Search reference

Regular Expression

<\s*@+(?:(?!<@+).)*>

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