How to use a global regular expression

How to work with a multiline regular expression

$string = "Ray Harris\nAuthor"; // A multiline stri
$pattern1 = '/Harris$/';  // A non-multiline regular expression
preg_match($pattern1, $string); // Does not match Harris and returns 
$pattern2 = '/Harris$/m';  // A multiline regular expression
preg_match($pattern2, $string); // Matches Harris and returns 1

How to work with a global regular expression

$string = 'MBT-6745 MBT-5712'; 
$pattern = '/MBT-[[:digit:]]{4}/'; 
$count = preg_match_all($pattern, $string, $matches); 
foreach ($matches[0] as $match) {
  echo("<div>$match</div>\n");
}

    Description
      In a multiline regular expression, the ^ pattern matches the beginning of a line and the $ pattern matches the end of a line.
In a global regular expression, the pattern finds multiple matches in the string.

    

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