Suppose we've file name (with extension) as part of string and while displaying to users we want to replace file extension from string.

Here's how we can do this:

<?php
  $snippet
= 'Lorem ipsum dignissim interdico meus file.exe dolore ideo.';
  echo
preg_replace('/\\.[^.\\s]{3,4}?/', '', $snippet);
?>

Above function will find and replace all extensions from a string.

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