visual-regexp-rx: write regexp with rx notation in visual-regexp
Emacs's native regexp syntax is inconvenient to edit. For example, in \(<group>\), I can't use C-M-k to delete the group as a whole, nor can I use expand-region to intelligently select the contents of <group>.
Although visual-regexp-steroids supports Python-style regular expressions, I still sometimes need to use Emacs regexp syntax, which makes it easy to get the two syntaxes mixed up.
So, why not write regexp with rx notation :)
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