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<?php preg_match( '/^\{(\d+*)\}/', '{1234} + {4568}', $matches); print_r($matches); // 1234
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_match(): Compilation failed: quantifier does not follow a repeatable item at offset 7 in /in/A1a3h on line 2

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