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  1. <?php
  2.  
  3. $regExp="/(,.[^ ])/ui";
  4. $text = "Привет,привет. Здравствуй, здравствуй,здравствуй .";
  5. $error = array();
  6. preg_match_all($regExp, $text, $error);
  7. var_dump($error);
Success #stdin #stdout 0.02s 24192KB
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array(2) {
  [0]=>
  array(3) {
    [0]=>
    string(5) ",пр"
    [1]=>
    string(4) ", з"
    [2]=>
    string(5) ",зд"
  }
  [1]=>
  array(3) {
    [0]=>
    string(5) ",пр"
    [1]=>
    string(4) ", з"
    [2]=>
    string(5) ",зд"
  }
}
https://ideone.com/CxAF89
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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