bug#50766: Regexp paren pairs in query-replace-regexp prompt should be highlighted

[martin rudalics]

> I wonder if it could be a generic feature which besides working in the
> minibuffer for regexps would also work when typing escaped parens in
> in strings, e.g. when using a string regexp in a program:
>
>     "stuff ( \\(  ) "
>
> Here it could indicate the mismatching parens.

I can only offer you my old regexp-lock-mode (attached).  In an .el
buffer do M-x turn-on-regexp-lock-mode and tell me how it works.

martin

regexp-lock.el
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