bug#52558: Option for easier typing of regexps

[Juri Linkov]

>>>> Such option already exists, and it allows using custom regexp syntax
>>>> both for isearch and query-replace:
>>>
>>> Interesting, though its help mentions only isearch, so if I start
>>> M-x query-replace-regexp directly, it doesn't seem affected.
>>
>> If you want to use M-x query-replace directly,
>> then simpler would be add replace-regexp-function
>> that you can use with:
>>
>> (setq replace-regexp-function
>
> And additional change is needed for correct highlighting:
>
> @@ -2690,7 +2693,8 @@ replace-highlight
> +         (isearch-regexp-function (or replace-regexp-function

This is pushed to master, so now it's possible to provide a custom
regexp converter for search and replace using isearch-regexp-function
and replace-regexp-function.