Hello,

I think I found a bug in Functions/Misc/regexp-replace

Steps to reproduce:

zsh -f
str='x :=bad'
autoload regexp-replace
regexp-replace str 'a' 'z' && echo $str

Actual Output:
(eval):1: bzd not found

Expected:
x :=bzd

Root cause:
Line 41: eval ${1}=${(q)5}
It appears the ${(q)5} is not escaping = so the =command is executed after :

Instead of 'x\ :\=bad', you get '= x\ :=bad'

One way to fix:
41: eval ${1}=${(qqq)5}

Patch file is attached.

Thanks
Jacob Menke