Open Radar

 
Summary:
When using the Find and Replace feature of Xcode (Find > Find and Replace...), one cannot use regex capture groups to reference a part of the matched expression in the replacement string.

Steps to Reproduce:
1. Open a source file
2. Open the Find and Replace view (Find > Find and Replace)
3. Select the regex find mode (how to varies depending on the Xcode version you're using)
4. Type a regex with capture groups in the Find text field. eg. `@property int (.+?);`
5. Type a replacement string with references to the capture groups in the Replace text field. eg. `@property double \1;`

Expected Results:
The reference to the capture group (`\1`) gets expanded to the part of the string matched by the regex's capture group.

So, for example:
@property int foobar;

will become after replacement:
@property double foobar;

Observed Results:
References do not get expanded.

So, for example:
@property int foobar;

will become after replacement:
@property double \1;

Version:
Xcode 8.3.x
Xcode 9.0 beta (9M136h)

Notes:
According to this blog post, this used to work (?) : http://roadfiresoftware.com/2013/12/replacing-regular-expressions-in-an-xcode-project/

Configuration: