Replace last segment of string

I need a function that will take in an argument and replace the last segment of a string with that argument. Separator is a colon.

example1:
pass in "newSegName"
string is - "seg1:seg2:seg3:seg4"
returns - "seg1:seg2:seg3:newSegName"

example2:
pass in "newSegName2"
string is - "seg1:seg2:seg3:seg4:seg5:seg6"
returns - "seg1:seg2:seg3:seg4:seg5:newSegName"
894359Asked:
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OpalelementCommented:
Code snippet attached
<script>
var str = "seg1:seg2:seg3:seg4";
var r_str = "newSegName";
var str_arr = str.split(":");
str_arr[str_arr.length-1] = r_str;
alert(str_arr.join(":"));
</script>

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0
fsze88Commented:
in another option by regular expression
<script type="text/javascript">
var str = "seg1:seg2:seg3:seg4";
var r_str = "newSegName";
var replaceRegExp = new RegExp (":[^:]+$", "g");
var newString = str.replace(replaceRegExp, ":"+r_str);
document.write(newString);
</script>
0
fsze88Commented:
or this
<script type="text/javascript">
var str = "seg1:seg2:seg3:seg4";
var r_str = "newSegName";
var replaceRegExp = new RegExp ("^(.+:)([^:]+)$", "g");
var newString = str.replace(replaceRegExp, "$1" + r_str);
document.write(newString);
</script>
0
GwynforWebCommented:
try this

<script>
function newString(add,str){
   return str.replace(/:[^:]*$/,':'+add)
}

alert(newString( "newSegName","seg1:seg2:seg3:seg4"))

</script>
0

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