Strings Php

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  4. Using preg_grep()
$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";
}
?>