fix(gnokii): escape ERE special characters in constructed regex

Author: akinomyoga

Diff for: completions/gnokii

@@ -225,7 +225,8 @@ _comp_cmd_gnokii()
 
     # these 2 below are allowed in combination with others
     local main_cmd
-    _comp_split -l main_cmd "$(command sed -e '/--config/d;/--phone/d' <<<"$all_cmd")"
+    _comp_split -l main_cmd "$(command sed -e '/--config/d;/--phone/d' -e \
+        's/[][\(){}|^$*+?.]/\\&/g' <<<"$all_cmd")"
     # don't provide main command completions if one is
     # already on the command line
     local IFS='|'