Regular Expressions for Those Nasty Autorelease Statements in ARC Migration

Maybe I'm missing something and the "migrate to ARC" tool in the XCode 4.2 Beta replaces your autorelease statements, but that's not what I've found. Please correct me if I'm wrong.

Here's a simple regex replace in Textmate for changing lines like:

[[[Thing alloc] initWithWhatever:whoever] autorelease];

to 

[[Thing alloc] initWithWhatever:whoever];

The regex is 

(\[\[\[)([^\]]*\][^\]]*\])(\ autorelease\]);

and the replacement string is:

[[$2;

Then I needed to fix these lines

for (Thinger *thing in [thingers copy] autorelease])

and I used regex:

(\[)([^\]]*\][^\]]*)(\ autorelease\])

and the replacement string is:

$2