Any way to replace characters on Swift String?

14 Solutions Collect From Internet About “Any way to replace characters on Swift String?”

This answer has been updated for Swift 3. If you’re still using Swift 1 or 2, see the revision history.

You have a couple of options. You can do as @jaumard suggested and use replacingOccurrences()

let aString = "This is my string"
let newString = aString.replacingOccurrences(of: " ", with: "+", options: .literal, range: nil)

And as noted by @cprcrack below, the options and range parameters are optional, so if you don’t want to specify string comparison options or a range to do the replacement within, you only need the following.

let aString = "This is my string"
let newString = aString.replacingOccurrences(of: " ", with: "+")

Or, if the data is in a specific format like this, where you’re just replacing separation characters, you can use components() to break the string into and array, and then you can use the join() function to put them back to together with a specified separator.

let toArray = aString.components(separatedBy: " ")
let backToString = toArray.joined(separator: "+")

Or if you’re looking for a more Swifty solution that doesn’t utilize API from NSString, you could use this.

let aString = "Some search text"

let replaced = String( {
    $0 == " " ? "+" : $0

You can use this:

let s = "This is my string"
let modified = s.replace(" ", withString:"+")    

If you add this extension method anywhere in your code:

extension String
    func replace(target: String, withString: String) -> String
       return self.stringByReplacingOccurrencesOfString(target, withString: withString, options: NSStringCompareOptions.LiteralSearch, range: nil)

Swift 3:

extension String
    func replace(target: String, withString: String) -> String
        return self.replacingOccurrences(of: target, with: withString, options: NSString.CompareOptions.literal, range: nil)

Swift 3 Solution

let exampleString = "Example string"

//Solution suggested above in Swift 3.0
let stringToArray = exampleString.components(separatedBy: " ")
let stringFromArray = stringToArray.joined(separator: "+")

//Swiftiest solution
let swiftyString = exampleString.replacingOccurrences(of: " ", with: "+")

Did you test this :

var test = "This is my string"

let replaced = test.stringByReplacingOccurrencesOfString(" ", withString: "+", options: nil, range: nil)

A Swift 3 solution along the lines of Sunkas’s:

extension String {
    mutating func replace(_ originalString:String, with newString:String) {
        self = self.replacingOccurrences(of: originalString, with: newString)


var string = "foo!"
string.replace("!", with: "?")



I am using this extension:

extension String {

    func replaceCharacters(characters: String, toSeparator: String) -> String {
        let characterSet = NSCharacterSet(charactersInString: characters)
        let components = self.componentsSeparatedByCharactersInSet(characterSet)
        let result = components.joinWithSeparator("")
        return result

    func wipeCharacters(characters: String) -> String {
        return self.replaceCharacters(characters, toSeparator: "")


let token = "<34353 43434>"
token.replaceCharacters("< >", toString:"+")

A category that modifies an existing mutable String:

extension String
    mutating func replace(originalString:String, withString newString:String)
        let replacedString = self.stringByReplacingOccurrencesOfString(originalString, withString: newString, options: nil, range: nil)
        self = replacedString


name.replace(" ", withString: "+")

Swift 3 solution based on Ramis’ answer:

extension String {
    func withReplacedCharacters(_ characters: String, by separator: String) -> String {
        let characterSet = CharacterSet(charactersIn: characters)
        return components(separatedBy: characterSet).joined(separator: separator)

Tried to come up with an appropriate function name according to Swift 3 naming convention.

Here is the example for Swift 3:

var stringToReplace = "This my string"
if let range = stringToReplace.range(of: "my") {
   stringToReplace?.replaceSubrange(range, with: "your")

If you don’t want to use the Objective-C NSString methods, you can just use split and join:

var string = "This is my string"
string = join("+", split(string, isSeparator: { $0 == " " }))

split(string, isSeparator: { $0 == " " }) returns an array of strings (["This", "is", "my", "string"]).

join joins these elements with a +, resulting in the desired output: "This+is+my+string".

I’ve implemented this very easy func:

func convap (text : String) -> String {
    return text.stringByReplacingOccurrencesOfString("'", withString: "''")

So you can write:

let sqlQuery = "INSERT INTO myTable (Field1, Field2) VALUES ('\(convap(value1))','\(convap(value2)')

I think Regex is the most flexible and solid way:

var str = "This is my string"
let regex = try! NSRegularExpression(pattern: " ", options: [])
let output = regex.stringByReplacingMatchesInString(
    options: [],
    range: NSRange(location: 0, length: str.characters.count),
    withTemplate: "+"
// output: "This+is+my+string"

Swift extension:

extension String {

    func stringByReplacing(replaceStrings set: [String], with: String) -> String {
        var stringObject = self
        for string in set {
            stringObject = self.stringByReplacingOccurrencesOfString(string, withString: with)
        return stringObject


Go on and use it like let replacedString = yorString.stringByReplacing(replaceStrings: [" ","?","."], with: "+")

The speed of the function is something that i can hardly be proud of, but you can pass an array of String in one pass to make more than one replacement.

Here’s an extension for an in-place occurrences replace method on String, that doesn’t no an unnecessary copy and do everything in place:

extension String {
    mutating func replaceOccurrences(of target: String, with replacement: String, options: String.CompareOptions = [], locale: Locale? = nil) {
        var range: Range<String.Index>?
        repeat {
            range = self.range(of: source, options: options, range: { $0.lowerBound..<self.endIndex }, locale: locale)
            if let range = range {
                self.replaceSubrange(range, with: new)
        } while range != nil

(The method signature also mimics the signature of the built-in String.replacingOccurrences() method)

May be used in the following way:

var string = "this is a string"
string.replaceOccurrences(of: " ", with: "_")
print(string) // "this_is_a_string"