Regular Expressions 101

{the literal { (123₁₀ / 173₈ / 7B₁₆)

Atomic Group(?>[^{}]|(?R))*

*repeats the group contents below any number of times:

1st Alternative[^{}]

Negated Character Class[^{}]

{the literal { (123₁₀ / 173₈ / 7B₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

2nd Alternative(?R)

(?R)recurses into the entire pattern

\}the literal } (125₁₀ / 175₈ / 7D₁₆)

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

{(?>[^{}]|(?R))*\}

New

Why is preg_match_all not working?
$pattern = '/\{(?:[^{}]|(?R))*\}/';
$result = 161240 characters
       if (preg_match_all($pattern, $result, $matches)){ {
            echo 'Success';
        } else {
            echo 'Not working';
        }
}

Regular Expression

Extraction