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// Define a dummy text, for testing...$Text = "Title: Hello world！
";$Text .= "Author: Jonas
";$Text .= "This is a example message！

";$Text .= "Title: Entry 2
";$Text .= "Author: Sonja
";$Text .= "Hello world, what"s up！
";// This function will replace specific matches// into a new formfunction RewriteText（$Match）{// Entire matched section: // --> /.../$EntireSection = $Match[0];// --> "
Title: Hello world！"// Key // --> （[a-z0-9]+）$Key= $Match[1];// --> "Title"// Value // --> （[^

]+）$Value= $Match[2];// --> "Hello world！"// Add some bold （<b>） tags to around the key toreturn "<b>" . $Key . "</b>: " . $Value;}// The regular expression will extract and pass all "key: value" pairs to// the "RewriteText" function that is definied above$NewText = preg_replace_callback（"/[
]（[a-z0-9]+）: （[^

]+）/i", "RewriteText", $Text）;// Print the new modified textprint $NewText;