$re = '/^\s*\@AlternateMessage\({\s*(\"[^"]*\"\s*,?\s*)+}\)\n/m';
$str = ' @Default("Stock ()")
String Stock(int count);
@DefaultMessage("Assign()")
@AlternateMessage({
"({})", "Assign"
})
String Assign(@PluralCount int count);
@DefaultMessage("Assign()")
@AlternateMessage({
"({})", "Assign",
"=0", "{0} Assign definitions"
})
String Assign(@PluralCount int count);
@DefaultMessage("Form")
String Form();';
$subst = "";
$result = preg_replace($re, $subst, $str);
echo "The result of the substitution is ".$result;
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php