* guix/ui.scm (package->recutils): Add #:highlighting parameter and use it. (display-search-results): Add #:regexps parameter; call 'colorize-full-matches' and pass #:highlighting. * guix/scripts/package.scm (process-query): Pass #:regexps to 'display-search-results'. * guix/scripts/home.scm (search): Likewise. * guix/scripts/system/search.scm (service-type->recutils): Add #:highlighting parameter and use it.