\n";
if(empty($matches)) echo "No
\n";
else echo "Yes
\n";
// Task 2: How many matches are there?
echo "\n
*** Number of Matches ***
\n";
echo count($matches)."
\n";
// Task 3: What is the first match?
echo "\n
*** First Match ***
\n";
if(!empty($matches)) echo array_values($matches)[0]."
\n";
// Task 4: What are all the matches?
echo "\n
*** Matches ***
\n";
if(!empty($matches)) {
foreach ($matches as $match) echo $match."
\n";
}
// Task 5: Replace the matches
$replaced = preg_replace_callback(
$regex,
// in the callback function, if Group 1 is empty,
// set the replacement to the whole match,
// i.e. don't replace
function($m) { if(empty($m[1])) return $m[0];
else return "Superman";},
$subject);
echo "\n
*** Replacements ***
\n";
echo $replaced."
\n";
// Task 6: Split
// Start by replacing by something distinctive,
// as in Step 5. Then split.
$splits = explode("Superman",$replaced);
echo "\n
*** Splits ***
\n";
echo ""; print_r($splits); echo "
";