New implementation

Be concise.

Be useful.

All contributions dictatorially edited by webmasters to match personal tastes.

Please do not paste any copyright violating resource.

Please try to avoid dependencies to third-party libraries and frameworks.

Other implementations
string x2 = x.Replace(y, z);
import std.array;
auto x2 = x.replace(y,z);  
var x2 = x.replaceAll(y, z);
x2 = String.replace(x, y, z)
X2 = binary:replace(X, Y, Z, [global]).
import "strings"
x2 := strings.Replace(x, y, z, -1)
import Data.List
allchanged [] _ _ = []
allchanged input from to = if isPrefixOf from input
  then to ++ allchanged (drop (length from) input) from to
  else head input : allchanged (tail input) from to

x2 = allchanged x y z
var x2 = x.replace(new RegExp(y, 'g'), z);
String x2 = x.replace(y, z);
x2 = x:gsub(y,z)
$x2 = str_replace($y, $z, $x);
x2 := StringReplace(x, y, z, [rfReplaceAll]);
substr($a, 5, 2) = "replacement text";
x2 = x.replace(y, z)
x2 = x.gsub(y, z)
let x2 = x.replace(&y, &z);