/usr/lib/surfraw/aur is in surfraw 2.2.9-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#
# AUTHOR: René Reigel based on piratebay by J.R. Mauro
#         Ivy Foster added additional search options
#
# DESC: Search the Arch User Repository
# $ID$
# elvis: aur		-- Search aur.archlinux.org for PKGBUILDs
. surfraw || exit 1
w3_config_hook () {
    def   SURFRAW_aur_action   "Search=Go"
    def   SURFRAW_aur_category "any"
    def   SURFRAW_aur_order    "a"
    def   SURFRAW_aur_language en
    defyn SURFRAW_aur_outdated 0
    def   SURFRAW_aur_protocol "https"
    def   SURFRAW_aur_results  "$SURFRAW_results"
    def   SURFRAW_aur_search   name
    def   SURFRAW_aur_sort     name
}
w3_usage_hook () {
    cat <<EOF
Usage: $w3_argv0 [options] [search words]...
Description:
  Search aur.archlinux.org for PKGBUILDS
Local options
  -category                     Search the given AUR category
                                Consult aur.archlinux.org/packages.php for
                                    a complete list.
                                Default: any
  -language                     Search in your your language
                                See aur.archlinux.org for available languages
                                Default: en
  -no-https                     Connect using HTTP, rather than HTTPS.
                                This disables logging in.
                                Default: use $SURFRAW_aur_protocol
  -order=ascending|descending   Organize in ascending or descending order
                                Default: ascending
  -orphans                      Search orphaned packages
  -outdated                     Search for out-of-date packages
  -results=NUM                  Number of search results returned
                                Default: $SURFRAW_aur_results
                                Must be in range 25-100
  -search=                      Search for one of...
          name          |       Package name
          maintainer    |       Maintainer
          submitter     |       Submitter
                                Default: name
  -sort=                        Sort by...
        name            |       Package name
        category        |       Package category
        location        |       Package location
        votes           |       Number of votes
        maintainer      |       Package maintainer
        age             |       Package age
                                Default: name
EOF
    w3_global_usage
}
w3_parse_option_hook () {
    opt="$1"
    optarg="$2"
    case "$opt" in
        -category=*) setopt   SURFRAW_aur_category "$optarg" ;;
        -language=*) setopt   SURFRAW_aur_language "$optarg" ;;
        -no-https)   setopt   SURFRAW_aur_protocol "http" ;;
        -orphans*)   setopt   SURFRAW_aur_action   "Orphans=Orphans" ;;
        -order=d*)   setopt   SURFRAW_aur_order    d ;;
        -order=*)    setopt   SURFRAW_aur_order    a ;;
        -outdated*)  setoptyn SURFRAW_aur_outdated 1 ;;
        -results=*)  setopt   SURFRAW_aur_results  "$optarg" ;;
        -search=*)   setopt   SURFRAW_aur_search   "$optarg" ;;
        -sort=*)     setopt   SURFRAW_aur_sort     "$optarg" ;;
        *) return 1 ;;
    esac
    return 0
}
w3_config
w3_parse_args "$@"
case "$SURFRAW_aur_category" in
  a*)  aur_category=0 ;;
  da*) aur_category=2 ;;
  de*) aur_category=3 ;;
  ed*) aur_category=4 ;;
  em*) aur_category=5 ;;
  ga*) aur_category=6 ;;
  gn*) aur_category=7 ;;
  i*)  aur_category=8 ;;
  kd*) aur_category=9 ;;
  ke*) aur_category=19 ;;
  l*)  aur_category=10 ;;
  mo*) aur_category=11 ;;
  mu*) aur_category=12 ;;
  n*)  aur_category=13 ;;
  o*)  aur_category=14 ;;
  sc*) aur_category=15 ;;
  sy*) aur_category=16 ;;
  x1*) aur_category=17 ;;
  xf*) aur_category=18 ;;
  *)   aur_category=0 ;;
esac
case "$SURFRAW_aur_search" in
  n*) aur_search_by=nd ;;
  m*) aur_search_by=m ;;
  s*) aur_search_by=s ;;
  *)  aur_search_by=nd ;;
esac
case "$SURFRAW_aur_sort" in
  n*) aur_sort_by=n ;;
  c*) aur_sort_by=c ;;
  l*) aur_sort_by=l ;;
  v*) aur_sort_by=v ;;
  m*) aur_sort_by=m ;;
  a*) aur_sort_by=a ;;
  *)  aur_sort_by=n ;;
esac
# Use SURFRAW_lang if present and the country has not been changed
# More or less verbatim from the google elvis
if test -n "$SURFRAW_lang" -a "$SURFRAW_aur_language" = "en"; then
    SURFRAW_aur_language="$SURFRAW_lang";
fi
case "$SURFRAW_aur_language" in
  ca|cs|de|en|es|fr|hr|hu|it|nb_no|nb_NO|pl|pt|ro|ru|sr|tr|uk|zh_cn|zh_CN) aur_lang="$SURFRAW_aur_language" ;;
  *) aur_lang=en ;;
esac
# w3_args now contains a list of arguments
if test -z "$w3_args" && test "$SURFRAW_aur_action" = "Search=Go"; then
    w3_browse_url "${SURFRAW_aur_protocol}://aur.archlinux.org/packages.php?setlang=${aur_lang}"
else
    escaped_args=`w3_url_of_arg $w3_args`
    if [ "$SURFRAW_aur_outdated" = 1 ]; then
        w3_browse_url "${SURFRAW_aur_protocol}://aur.archlinux.org/packages.php?O=0&L=0&detail=1&C=${aur_category}&K=${escaped_args}&SeB=${aur_search_by}&SB=${aur_sort_by}&SO=${SURFRAW_aur_order}&PP=${SURFRAW_aur_results}&do_${SURFRAW_aur_action}&outdated=on&setlang=${aur_lang}"
    else
        w3_browse_url "${SURFRAW_aur_protocol}://aur.archlinux.org/packages.php?O=0&L=0&detail=1&C=${aur_category}&K=${escaped_args}&SeB=${aur_search_by}&SB=${aur_sort_by}&SO=${SURFRAW_aur_order}&PP=${SURFRAW_aur_results}&do_${SURFRAW_aur_action}&setlang=${aur_lang}"
    fi
fi
 |