What perl version? I get this on 5.6.1 and 5.7.2:

Nested quantifiers in regex; marked by <-- HERE in m/\*{4}title\*{4}(.
+*?)\*{4}he
adings\*{4}+ <-- HERE / at tst7 line 60.
[download]

It seems like a bug to me, because it looks valid, I think. (Someone will surely correct me if I'm wrong).

Update: Ignore the above. Bad copy n paste job. Though I DO see many use strict related errors now.