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Suppose I have bár written in a file, I would like to look for bar in swiper and find the occurrences of bár alongside the expected occurrences of bar, how I can do this? This would also apply to characters like e=é=è, o=ö, u=ü, a=å, o=ó=ö, c=ç, etc.

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Having bar match bár is called character folding, and is supported by the built-in functions isearch and query-replace since Emacs 25; see (emacs) Lax Search and (emacs) Search Customizations for details.

swiper automatically performs character folding when search-default-mode is set to the function char-fold-to-regexp, which you can achieve by e.g. adding

(setq search-default-mode #'char-fold-to-regexp)

to your user-init-file. Voila:

char folding

  • That worked for swiper, but for some reason it did not work with ivy-bibtex. – k76u4vkweek547v7 Jun 19 '18 at 15:11
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    @k76u4vkweek547v7 That is because the char-fold-to-regexp integration is specific to the regexp builder for swiper. Feel free to submit a feature request on the project's issue tracker: github.com/abo-abo/swiper/issues. – Basil Jun 19 '18 at 15:31

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