Fix unused regex

help.go

@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"io"
 	"os"
-	"regexp"
 	"strings"
 	"text/tabwriter"
 	"text/template"
@@ -157,8 +156,6 @@ func ShowAppHelp(c *Context) (err error) {
 	return nil
 }
 
-var shortFlagRegex = regexp.MustCompile(`^-`)
-
 // DefaultAppComplete prints the list of subcommands as the default app completion method
 func DefaultAppComplete(c *Context) {
 	DefaultCompleteWithFlags(nil)(c)