Remove duplicate characters JS code

Remove duplicate characters JS code
-->

<script type= "Text/vbscript" >
<!--
Dim str
Str= "Happy heart, in me who I am who I am good is is haha, we we we are who I am who I am who I am who I am haha haha ha ha ha ha ha haha haha!"
Set regex = new RegExp
Regex.pattern = "((. { 1,3}?) 2{2,}) "
Regex.global = True
Regex.ignorecase = True
Set matches = Regex.execute (str) ' performs a search.
For the match in matches ' loops through the matches collection.
Alert ("Duplicate character:" & Match.submatches (1))
Alert ("Entire repeating character:" & Match.submatches (0))
Next

-->
</script>