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<?php
    $input = "This is another text string. 2.0 times longer.";
    echo preg_replace("/(^\.|\s\.|\.\s|\.$)/", " $1", $input);
?>

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• # 2:   hide show   clone   input   603 days 1 hour ago    Success

  result: Success     time: 0s    memory: 13112 kB     returned value: 0

  input:

  <?php
      $input = "This is another text string. 2.0 times longer.";
      echo preg_replace("#(\S)\.(\s|$)#", "$1. ", $input);
  ?>

  output:

  This is another text string . 2.0 times longer .
• # 1:   hide show   clone   input   603 days 1 hour ago    Success

  result: Success     time: 0s    memory: 13112 kB     returned value: 0

  input: no
  output:

  This is another text string . 2.0 times longer .