Please see the following rule, why is it zero?

echo preg_match("/app\\common\\model\\NewsModel/","app\common\model\NewsModel",$matches,PREG_OFFSET_CAPTURE); // 0



preg_match("/app\\common\\model\\([a-zA-Z]+)Model/","app\common\model\NewsModel",$matches); -sharp :reg_match(): Compilation failed: unmatched parentheses at offset 27

solve

Dec.29,2021

echo preg_match("/app\\\\common\\\\model\\\\NewsModel/",'app\common\model\NewsModel',$matches,PREG_OFFSET_CAPTURE);
preg_match("/app\\\\common\\\\model\\\\([a-zA-Z]+)Model/",'app\common\model\NewsModel',$matches); 
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