javascript - string replace

Question

Not sure why but i can't seem to replace a seemingly simple placeholder.

My approach

var content = 'This is my multi line content with a few {PLACEHOLDER} and so on';
content.replace(/{PLACEHOLDER}/, 'something');
console.log(content); // This is multi line content with a few {PLACEHOLDER} and so on

Any idea why it doesn't work?

Thanks in advance!

• user517400: Add ' ' around {PLACEHOLDER} :-)
• Shrinath: you need to store the result of replace somewhere : try this : var content = 'this is {placeholder}'; content = content.replace(/{placeholder}/,'something'); alert(content); should work

Answer 1

Here's something a bit more generic:

var formatString = (function()
{
 var replacer = function(context)
 {
 return function(s, name)
 {
 return context[name];
 };
 };
 return function(input, context)
 {
 return input.replace(/\{(\w+)\}/g, replacer(context));
 };
})();

Usage:

>>> formatString("Hello {name}, {greeting}", {name: "Steve", greeting: "how's it going?"});
"Hello Steve, how's it going?"

Answer 2

JavaScript's string replace does not modify the original string. Also, your code sample only replaces one instance of the string, if you want to replace all, you'll need to append 'g' to the regex.

var content = 'This is my multi line content with a few {PLACEHOLDER} and so on';
var content2 = content.replace(/{PLACEHOLDER}/g, 'something');
console.log(content2); // This is multi line content with a few {PLACEHOLDER} and so on

Answer 3

Try this way:

var str="Hello, Venus";
document.write(str.replace("venus", "world"));