how to replace part of part of string in javascript -

i have 2 guids. looking replace c013d94e 1st guid cd11d94e of second guid in javascipt.

i checked javascript replace() method not sure how can use specific case.

c013d94e-3210-e511-82ec-303a64efb676 - 1st guid

cd11d94e-3210-e511-82ec-303a64efb676 - 2nd guid

following code trying

for(var i=0; < response[1].length;i++)     angular.foreach($scope.studentpermissions[i][0].children, function (subject) {     string 1stguid= response[1].data[i].id;   // contains cd11d94e-3210-e511-82ec-303a64efb676     subject.id = // contains c013d94e-3210-e511-82ec-303a64efb676      }); 

@jamen. yes other part of 1st string same. how can use concatenate?

you don't need use replace then? make brand new string:

var guid = "cd11d94e-3210-e511-82ec-303a64efb676"; 

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but, answer question in title:

var input = "c013d94e-3210-e511-82ec-303a64efb676"; var output = input.replace("c013d94e", "cd11d94e");  console.log(output); // cd11d94e-3210-e511-82ec-303a64efb676 

but said, in situation shouldn't necessary, based on quote.