Get the string up to a specific character

Question

var hello = \"hello, how are you?\"

var hello2 = \"hello, how are you @tom?\"

i want to delete every letter behind the @ sign.

result shou

Answer 1

Try regular expressions, they are much safer (if you know what you are doing...)

  let hello2 = "hello, how are you @tom, @my @next @victim?"

    let deletedStringsAfterAtSign = hello2.replacingOccurrences(of: "@\\w+", with: "", options: .regularExpression, range: nil)

    print(deletedStringsAfterAtSign)
    //prints "hello, how are you ,   ?"

And this code removes exactly what you need and leaves the characters after the strings clear, so you can see the , and ? still being there. :)

EDIT: what you asked in comments to this answer:

  let hello2 = "hello, how are you @tom, @my @next @victim?"

  if let elementIwannaAfterEveryAtSign = hello2.components(separatedBy: " @").last
  {
    let deletedStringsAfterAtSign = hello2.replacingOccurrences(of: "@\\w+", with: elementIwannaAfterEveryAtSign, options: .regularExpression, range: nil)
    print(deletedStringsAfterAtSign)
    //prints hello, how are you victim?, victim? victim? victim??
    }