fix(gnokii): avoid non-POSIX ERE \b

The word-boundary anchor \b is not supported by POSIX Extended Regular
Expressions (ERE).  Also, the previous implementation did not consider
the word-boyndary for the last element.  We here explicitly match the
trailing /[^_[:alnum:]]/ or /$/.

Another issue is that the previous implementation did not work because
of contaminated newlines in the ERE.  We now split the results by
newlines and then join the elements with IFS='|'.

Author: akinomyoga

completions/gnokii

@@ -224,10 +224,14 @@ _comp_cmd_gnokii()
     local all_cmd="$(_parse_help "$1" "--help all")"
 
     # these 2 below are allowed in combination with others
-    local main_cmd=$(command sed -e '/--config/d;/--phone/d' <<<"$all_cmd")
+    local main_cmd
+    _comp_split -l main_cmd "$(command sed -e '/--config/d;/--phone/d' <<<"$all_cmd")"
     # don't provide main command completions if one is
     # already on the command line
-    [[ $COMP_LINE =~ $(tr ' ' '\b|' <<<"$main_cmd") ]] && return
+    local IFS='|'
+    local regex_main_cmd="(${main_cmd[*]})($|[^_[:alnum:]])"
+    IFS=$' \t\n'
+    [[ $COMP_LINE =~ $regex_main_cmd ]] && return
 
     COMPREPLY=($(compgen -W "$all_cmd" -- "$cur"))
 } &&