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<?php var_dump(preg_match('[0-9a-zA-Z]', 'bob', $matches), $matches); echo '---------', PHP_EOL; var_dump(preg_match('~[0-9a-zA-Z]~', 'bob', $matches), $matches); echo '---------', PHP_EOL; var_dump(preg_match('~[0-9a-zA-Z]+~', 'bob', $matches), $matches); ?>
Output for git.master, git.master_jit, rfc.property-hooks
int(0) array(0) { } --------- int(1) array(1) { [0]=> string(1) "b" } --------- int(1) array(1) { [0]=> string(3) "bob" }

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