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How to interpret this regular expression

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Release： 2016-08-18 09:16:11
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<code>    const VARIABLE_REGEX = <<<'REGEX'
\{
    \s* ([a-zA-Z_][a-zA-Z0-9_-]*) \s*
    (?:
        : \s* ([^{}]*(?:\{(?-1)\}[^{}]*)*)
    )?
\}
REGEX;</code>
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<code>    const VARIABLE_REGEX = <<<'REGEX'
\{
    \s* ([a-zA-Z_][a-zA-Z0-9_-]*) \s*
    (?:
        : \s* ([^{}]*(?:\{(?-1)\}[^{}]*)*)
    )?
\}
REGEX;</code>
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You will need to use this https://www.debuggex.com

Related labels：
php regular expression
source：php.cn
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