Maybe a bug about RegexExp Replace

I append a range of small exe files, then select 'Replace' without 'Use regular expressions'.
Actually I would want to use RegexExp, but forget to click the checkbox.
'Apply to' is 'Name'.

In the 'Text to be replaced' textbox, type as below:
(?<=\d)

then the application losts respond.

I have attempted this action twice, and the result is the same.

---

Reply to #1:
I have been able to reproduce the error and has fixed it. The fix will be included in the next release. A beta of the next release is expected soon.

---