How to Perform Search Operation on Value in Firebase? AngularJS -

say example, have 4 users email addresses:

hello@world.com hi@world.com  yo@world.com yeah@world.com 

this search query view

$scope.searchquery = "h"; 

i run query allows me list of user email address start letter "h".

usersref.orderbychild('email').startat($scope.searchquery).endat($scope.searchquery+"~").on('value', function(snapshot){       console.log(snapshot.val()); } 

so, results in here are:

hello@world.com hi@world.com 

however, i'd searchquery match whole string, not start letters. expected results in case ($searchquery = "h"):

hello@world.com hi@world.com yeah@world.com 

i've tried this:

usersref.orderbychild('email').startat($scope.searchquery).endat("~"+$scope.searchquery+"~").on('value', function(snapshot){           console.log(snapshot.val());     } 

the results includes 4 email addresses.

then, i've tried this:

usersref.orderbychild('email').startat("~"+$scope.searchquery).endat($scope.searchquery+"~").on('value', function(snapshot){               console.log(snapshot.val());         } 

the result null.

can me figure out please.

any answer appreciated.

thanks