Okay, so I'm trying to create a JavaScript function to replace specific characters in a string. What I mean by this is, lets say, searching a string character by character for a letter and if it matches, replacing it with another character. Ex, replacing "a" with "x": Hello, how are you? becomes Hello, how xre you? and Greetings and salutations becomes Greetings and sxlutations.
4 Answers
for removing multiple characters you could use a regex expression
yourString.replace(new RegExp('a', 'g'), 'x')
for removing the same with a case-insensitive match use
yourString.replace(new RegExp('a', 'gi'), 'x')
Comments
As String.replace() does not seem to fullfil the OPs desires, here is a full function to do the stuff the OP asked for.
function rep(s,from,to){
var out = "";
// Most checks&balances ommited, here's one example
if(to.length != 1 || from.length != 1)
return NULL;
for(var i = 0;i < s.length; i++){
if(s.charAt(i) === from){
out += to;
} else {
out += s.charAt(i);
}
}
return out;
}
rep("qwertz","r","X")
Comments
var s1 = document.getElementById('s1').innerHTML;
var s2 = s1.replace('a', 'x');
document.getElementById('s2').innerHTML = s2;<h1>Starting string:</h1>
<p id="s1">Hello, how are you?</p>
<h1>Resulting string:</h1>
<p id="s2"></p>
Comments
Here is a simple utility function that will replace all old characters in some string str with the replacement character/string.
function replace(str, old, replacement) {
var newStr = new String();
var len = str.length;
for (var i = 0; i < len; i++) {
if (str[i] == old)
newStr = newStr.concat(replacement);
else
newStr = newStr.concat(str[i]);
}
return str;
}
String.prototype.replacedoes exactly this. ex:('halp me plase').replace('a', 'x') === 'hxlp me plase'