PHP/String/preg grep

preg_grep

   <source lang="html4strict">

<?php

  $foods = array("pasta", "steak", "fish", "potatoes");
  $food = preg_grep("/^p/", $foods);
  print_r($food);

?>

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preg_grep() function searches all elements of input_array, returning all elements matching the regexp pattern.

   <source lang="html4strict">

Its syntax is: array preg_grep (string pattern, array input_array) <? $foods = array("pasta", "steak", "fish", "potatoes"); $p_foods = preg_grep("/p(\w+)/", $foods); $x = 0; while ($x < sizeof($p_foods)) :

  print $p_foods[$x]. "
";
  $x++;

endwhile; ?>

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Quickly finding lines that match a pattern

   <source lang="html4strict">

<? $pattern = "/\bo"reilly\b/i"; // only O"Reilly books $ora_books = preg_grep($pattern, file("/path/to/your/file.txt")); ?>

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Using preg_grep()

   <source lang="html4strict">

<? $text=<<<TEXT "asdf.asdf,asdf!asdf TEXT; $words = preg_split("/[",.!\s]/", $text, -1, PREG_SPLIT_NO_EMPTY); $double_letter_words = preg_grep("/([a-z])\\1/i",$words); foreach ($double_letter_words as $word) {

   print "$word\n";

} ?>

 </source>