JS Get started 5-character query and filter plus use regular expressions

<input type= "text" id= "txtstring"/><br/>
<input type= "button" value= "Filter special characters (JS)" onclick= "Searchstringandreplace ();" />
Find and replace the input in the text box from the string JS to *
function Searchstringandreplace () {
var str = document.getElementById ("txtstring"). Value;
var index = str.indexof ("JS", 0);
while (index>-1) {
str = str.replace ("JS", "*");
index = Str.indexof ("JS", index+1);
}
document.getElementById ("txtstring"). Value = str;
}

<input type= "button" value= "Find characters and filter (using regular expressions)" onclick= "Stringbyregex ();" />
Manipulating text with regular expressions
function Stringbyregex () {
var str = document.getElementById ("txtstring"). Value;
var result = Str.match (/JS/GI);
document.getElementById ("txtstring"). Value = Str.replace (/js/gi, "*");
Alert ("Altogether replaced" +result.length+ ");
}

JS Get started 5-character query and filter plus use regular expressions