$re = '`(?|(\[[\"]?.+?[\"]?\])(=>)\R\s*|(?<=\(0\) )(\{)\R\s*(\}))`';
$str = 'object(Symfony\\Component\\HttpFoundation\\Request)#250 (21) {
["attributes"]=>
object(Symfony\\Component\\HttpFoundation\\ParameterBag)#253 (1) {
["parameters":protected]=>
array(5) {
["_controller"]=>
object(Closure)#239 (2) {
["static"]=>
array(1) {
["app"]=>
object(Silex\\Application)#14 (8) {
["providers":protected]=>
array(5) {
[0]=>
object(Silex\\Provider\\HttpKernelServiceProvider)#17 (0) {
}
[1]=>
object(Silex\\Provider\\RoutingServiceProvider)#26 (0) {
}
[2]=>
object(Silex\\Provider\\ExceptionHandlerServiceProvider)#36 (0) {
}
[3]=>
object(Silex\\Provider\\TwigServiceProvider)#38 (0) {
}
[4]=>
object(Euskadi31\\Silex\\Provider\\CorsServiceProvider)#54 (0) {
}
}
["booted":protected]=>
bool(true)
["values":"Pimple\\Container":private]=>
array(37) {
["request.http_port"]=>
int(80)
["request.https_port"]=>
int(443)
["debug"]=>
bool(true)
["charset"]=>
string(5) "UTF-8"
["logger"]=>
NULL
["resolver"]=>
object(Symfony\\Component\\HttpKernel\\Controller\\ControllerResolver)#307 (1) {
["logger":"Symfony\\Component\\HttpKernel\\Controller\\ControllerResolver":private]=>
NULL
}
["argument_metadata_factory"]=>
object(Symfony\\Component\\HttpKernel\\ControllerMetadata\\ArgumentMetadataFactory)#301 (0) {
}
["argument_value_resolvers"]=>
array(5) {
[0]=>
object(Silex\\AppArgumentValueResolver)#298 (1) {
["app":"Silex\\AppArgumentValueResolver":private]=>
*RECURSION*
}
[1]=>
object(Symfony\\Component\\HttpKernel\\Controller\\ArgumentResolver\\RequestAttributeValueResolver)#295 (0) {
}
[2]=>
object(Symfony\\Component\\HttpKernel\\Controller\\ArgumentResolver\\RequestValueResolver)#292 (0) {
}
[3]=>
object(Symfony\\Component\\HttpKernel\\Controller\\ArgumentResolver\\DefaultValueResolver)#289 (0) {
}
[4]=>
object(Symfony\\Component\\HttpKernel\\Controller\\ArgumentResolver\\VariadicValueResolver)#286 (0) {
}
}';
$subst = "\1 \2";
$result = preg_replace($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