title: how to remove the id before the file name using php
body: <p>For this code: 
   <code>$file1='Package_document/3899_In Detail_Search_page_4584.docx'</code></p>
  
  <p>I tried this code, but it not working.
  <code>$pattern = preg_replace('/^[0-9_]+/','',$file1);</code></p>
  
  <p>i need to remove  this thing 3899_<br>
  How to remove ? Please help to find the answer</p>