.htacess to nginx directives

What would it be like in nginx directives?

Code:

RewriteEngine on
## Manejo de errores de Apache. Cuando se produzca uno de estos errores, redirigimos a una pagina especial desarrollada por nosotros.
ErrorDocument 404 /index.php
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
Rewriterule ^busqueda/$ pages/buscar.php?buscador=$1 [QSA,L]
Rewriterule ^genero/([A-Za-z0-9_-]+).html$ pages/tag.php?tag=$1 [QSA,L]
Rewriterule ^letra/([A-Za-z0-9_-]+).html$ pages/letra.php?letra=$1 [QSA,L]
Rewriterule ^anime/([A-Za-z0-9_-]+).html$ pages/anime.php?seo=$1 [QSA,L]
Rewriterule ^ova/([A-Za-z0-9_-]+).html$ pages/anime.php?seo=$1 [QSA,L]
Rewriterule ^pelicula/([A-Za-z0-9_-]+).html$ pages/anime.php?seo=$1 [QSA,L]
Rewriterule ^ver/([A-Za-z0-9_-]+).html$ pages/capitulo.php?url=$1 [QSA,L]

 

@S0ft
Something like this:
https://winginx.com/en/htaccess