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int preg_match_all ( string $pattern , string $subject [, array &$matches [, int $flags = PREG_PATTERN_ORDER [, int $offset = 0 ]]] )

<?php
$userinfo = "Name: <b>PHP</b> <br> Title: <b>Programming Language</b>";
preg_match_all ("/<b>(.*)<\/b>/U", $userinfo, $pat_array);
print_r($pat_array[0]);
?>

Array
(
    [0] => <b>PHP</b>
    [1] => <b>Programming Language</b>
)

<?php
// \\2 is an example of back-reference. This tells PCRE that it must match the second set of parentheses (here ([\w]+))
// with the result. Two backslashes are used because this is a double-quoted string.
$html = "<b>bold text</b>&lt;a href=howdy.html>click me</a>";

preg_match_all("/(<([\w]+)[^>]*>)(.*?)(<\/\\2>)/", $html, $matches, PREG_SET_ORDER);

foreach ($matches as $val) {
    echo "matched: " . $val[0] . "\n";
    echo "part 1: " . $val[1] . "\n";
    echo "part 2: " . $val[2] . "\n";
    echo "part 3: " . $val[3] . "\n";
    echo "part 4: " . $val[4] . "\n\n";
}
?>

matched: <b>bold text</b>
part 1: <b>
part 2: b
part 3: bold text
part 4: </b>

matched: &lt;a href=howdy.html>click me</a>
part 1: &lt;a href=howdy.html>
part 2: a
part 3: click me
part 4: </a>