What is the more elegant way to remove all characters after specific character in the String object in Swift

Question

What is the more elegant way to remove all characters after specific character in the String object in Swift?

Suppose that I have the following string:

Answer 1

I think this is better approach:

Update with Swift 4: (substring is now deprecated)

let smth = "element=value"

if let index = (smth.range(of: "=")?.upperBound)
{
  //prints "value"
  let afterEqualsTo = String(smth.suffix(from: index))

  //prints "element="
  let beforeEqualsToContainingSymbol = String(smth.prefix(upTo: index))
}

if let index = (smth.range(of: "=")?.lowerBound)
{
  //prints "=value"
  let afterEqualsToContainingSymbol = String(smth.suffix(from: index))

  //prints "element"
  let beforeEqualsTo = String(smth.prefix(upTo: index))
}