How to find this regex using PHP -

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सभी & lt; 1 & gt; & lt; / 1 & gt; और & lt; 2 & gt; & lt; / 2 & gt; और <3> एक स्ट्रिंग में & lt; 3 & gt; ... । 

 <कोड> & lt; (\ d +) & gt; & lt; / \ 1 & gt;

काम करना चाहिए यह सुनिश्चित करता है कि regex & lt; 1 & gt; & lt; / 4 & gt; उदाहरण के लिए मेल नहीं खाएगा।

\ 1 यहां जो मैच होगा पहले कैप्चरिंग समूह ( (\ d +) पहले कोण कोष्ठक में) के रूप में ठीक उसी स्ट्रिंग।


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