Bash function if else same condition bool return value [closed]

How can I avoid to make the same condition at 'else' again?

Here the code:

function isvalidlogin_orig {
 local username=$1
 local password=$2
 if [[ $password =~ $validpasswordregex ]];then
   password=`getmd5 $password`
   local line=(`grep -E "^${username}\s" ./protected/flatfiledatabase.txt`)
   [ ${#line[@]} -gt 0 ] && [ $password == ${line[1]} ]
 else
  [[ $password =~ $validpasswordregex ]]
 fi

}

the condition testing is the return value.