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<h1>Regex Modifier: [0-5]</h1>
<p>How many characters in the text "Call 555-2368" is a digit between "0" and "5":</p>
$txt = "Call 555-2368";
$pattern = "/[0-5]/";
echo preg_match_all($pattern, $txt);
<p>The matches were found here:</p>
echo preg_replace($pattern, "#", $txt);
<p>(Each match was replaced by a # character)</p>
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How many characters in the text "Call 555-2368" is a digit between "0" and "5":
5The matches were found here:
Call ###-##68(Each match was replaced by a # character)