How do I check if a string contains another string in Swift

Question

In Objective-C the code to check for a substring in an NSString is    NSString  string     hello Swift   NSRange textRange   string rangeOfString   Swift    if textRange location    NSNotFound        NSLog   exists        But how do I do this in Swift

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I ve found a couple of interesting use cases  These variants make use of the rangeOfString method and I include the equality example to show how one might best use the search and comparison features of Strings in Swift 2 0    In viewDidLoad   I assign the current object description  A Swift String  to self loadedObjectDescription self loadedObjectDescription   self myObject  description      Later after I ve made changes to self myObject  I can refer to the   following string comparison routines  setup as lazy variables that   return a Bool   This allows one to check the state at any time    lazy var objectHasChanges   Bool             guard self myObject    nil else   return false           return   self loadedObjectDescription    self myObject  description               A variant of this happens when sometimes I need to analyze a missing   property on that object  A string search allows me to find a   particular substring being set to nil  the default when an object is created         lazy var isMissingProperty   Bool             guard self myObject    nil else   return true           let emptyPropertyValue    myProperty   nil          return  self myObject  description rangeOfString emptyPropertyValue     nil    true   false

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You don t need to write any custom code for this  Starting from the 1 2 version Swift has already had all the methods you need    getting string length  count string   checking if string contains substring  contains string  substring   checking if string starts with substring  startsWith string  substring  and etc

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You can just do what you have mentioned   import Foundation     string contains  Swift      From the docs      Swift   s String type is bridged seamlessly to Foundation   s NSString   class  If you are working with the Foundation framework in Cocoa or   Cocoa Touch  the entire NSString API is available to call on any   String value you create  in addition to the String features described   in this chapter  You can also use a String value with any API that   requires an NSString instance    You need to import Foundation to bridge the NSString methods and make them available to Swift s String class

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IN SWIFT 3 0  let str    Hello Swift  if str lowercased   contains  Swift  lowercased          print  String Contains Another String     else       print  Not Exists       Output  String Contains Another String

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Here you go  Ready for Xcode 8 and Swift 3   import UIKit  let mString    This is a String that contains something to search   let stringToSearchUpperCase    String  let stringToSearchLowerCase    string   mString contains stringToSearchUpperCase    true mString contains stringToSearchLowerCase    false mString lowercased   contains stringToSearchUpperCase    false mString lowercased   contains stringToSearchLowerCase    true

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Another one  Supports case and diacritic options   Swift 3 0  struct MyString     static func contains   text  String  substring  String                         ignoreCase  Bool   true                         ignoreDiacritic  Bool   true  - gt  Bool        var options   NSString CompareOptions        if ignoreCase       options insert NSString CompareOptions caseInsensitive        if ignoreDiacritic       options insert NSString CompareOptions diacriticInsensitive         return text range of  substring  options  options     nil         Usage  MyString contains  Niels Bohr   substring   Bohr      true   iOS 9   Case and diacritic insensitive function available since iOS 9   if  available iOS 9 0          F  r Elise  localizedStandardContains  fur      true

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In Swift 3  if  a range of  b   options  String CompareOptions caseInsensitive  range  nil  locale  nil      nil       print  Done

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From the docs  it seems that calling containsString   on a String should work      Swift   s String type is bridged seamlessly to Foundation   s NSString   class  If you are working with the Foundation framework in Cocoa or   Cocoa Touch  the entire NSString API is available to call on any   String value you create  in addition to the String features described   in this chapter  You can also use a String value with any API that   requires an NSString instance    However  it doesn t seem to work that way   If you try to use someString containsString anotherString   you will get a compile time error that states  String  does not contain a member named  containsString    So  you re left with a few options  one of which is to explicitly bridge your String to Objective-C by using bridgeToObjectiveC   other two involve explicitly using an NSString and the final one involves casting the String to an NSString  By bridging  you d get   var string    hello Swift  if string bridgeToObjectiveC   containsString  Swift         println  YES       By explicitly typing the string as an NSString  you d get   var string  NSString    hello Swift  if string containsString  Swift         println  YES       If you have an existing String  you can initialize an NSString from it by using NSString string     var string    hello Swift  if NSString string  string  containsString  Swift         println  YES       And finally  you can cast an existing String to an NSString as below  var string    hello Swift  if  string as NSString  containsString  Swift         println  YES

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Check if it contains  Hello   let s    Hello World   if s rangeOfString  Hello      nil       print  Yes it contains  Hello

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With and new syntax in swift 4 you can just  string contains  Swift 4 is the best    string is your string variable

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Of all of the answers here  I think they either don t work  or they re a bit of a hack  casting back to NSString    It s very likely that the correct answer to this has changed with the different beta releases   Here is what I use   let string  String    hello Swift  if string rangeOfString  Swift      nil       println  exists       The     nil  became required with Beta 5

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Swift 3  Here you can see my smart search extension fro string that let you make a search on string for seeing if it contains  or maybe to filter a collection based on a search text   https   github com magonicolas Swift-Smart-String-Search

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SWIFT 4 is very easy    if  yourString contains  anyThing         Print  Exist

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Extension way Swift 4 extension String       func contains find  String  - gt  Bool          return self range of  find     nil           func containsIgnoringCase find  String  - gt  Bool          return self range of  find  options   caseInsensitive     nil          var value    quot Hello world quot   print value contains  quot Hello quot       true print value contains  quot bo quot          false  print value containsIgnoringCase find   quot hello quot          true print value containsIgnoringCase find   quot Hello quot          true print value containsIgnoringCase find   quot bo quot             false   Generally Swift 4 has contains method however it available from iOS 8 0   Swift 3 1 You can write extension contains  and containsIgnoringCase for String extension String        func contains   find  String  - gt  Bool       return self range of  find     nil          func containsIgnoringCase   find  String  - gt  Bool       return self range of  find  options   caseInsensitive     nil            Older Swift version extension String        func contains find  String  - gt  Bool         return self rangeOfString find     nil             func containsIgnoringCase find  String  - gt  Bool         return self rangeOfString find  options  NSStringCompareOptions CaseInsensitiveSearch     nil            Example  var value    quot Hello world quot   print value contains  quot Hello quot       true print value contains  quot bo quot          false  print value containsIgnoringCase  quot hello quot          true print value containsIgnoringCase  quot Hello quot          true print value containsIgnoringCase  quot bo quot             false

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Search string exist in employee name finding  var empName NSString    employeeDetails filterKeyString  as NSString  Case sensitve search  let rangeOfSearchString NSRange    empName rangeOfString searchString  options  NSStringCompareOptions CaseInsensitiveSearch      Not found  if rangeOfSearchString location    Foundation NSNotFound          search string not found in employee name       Found else          search string found in employee name

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Here is my first stab at this in the swift playground  I extend String by providing two new functions  contains and containsIgnoreCase   extension String       func contains other  String  - gt  Bool          var start   startIndex          do              var subString   self Range start  start    end  endIndex               if subString hasPrefix other                   return true                         while start    endIndex          return false            func containsIgnoreCase other  String  - gt  Bool          var start   startIndex          do              var subString   self Range start  start    end  endIndex   lowercaseString             if subString hasPrefix other lowercaseString                   return true                         while start    endIndex          return false           Use it like this  var sentence    This is a test sentence  sentence contains  this      returns false sentence contains  This      returns true sentence containsIgnoreCase  this      returns true   This is another test sentence  contains   test         returns true   I d welcome any feedback

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string containsString is only available in 10 10 Yosemite  and probably iOS8   Also bridging it to ObjectiveC crashes in 10 9  You re trying to pass a NSString to NSCFString  I don t know the difference  but I can say 10 9 barfs when it executes this code in a OS X 10 9 app     Here are the differences in Swift with 10 9 and 10 10  https   developer apple com library prerelease mac documentation General Reference APIDiffsMacOSX10 10SeedDiff index html containsString is only available in 10 10  Range of String above works great on 10 9   I am finding developing on 10 9 is super stable with Xcode beta2   I don t use playgrounds through or the command line version of playgrounds  I m finding if the proper frameworks are imported the autocomplete is very helpful

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If you want to check that one String contains another Sub-String within it or not you can check it like this too   var name   String     name    John has two apples      Now  in this particular string if you want to know if it contains fruit name  apple  or not you can do   if name contains  apple             print  Yes   it contains fruit name             else              print it does not contain any fruit name              Hope this works for you

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In iOS 8 and newer  you can use these two NSString methods    availability iOS  introduced 8 0  func containsString aString  String  - gt  Bool   availability iOS  introduced 8 0  func localizedCaseInsensitiveContainsString aString  String  - gt  Bool

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You can do exactly the same call with Swift   Swift 4  amp  Swift 5  In Swift 4 String is a collection of Character values  it wasn t like this in Swift 2 and 3  so you can use this more concise code1   let string    hello Swift  if string contains  Swift         print  exists       Swift 3 0   var string    hello Swift   if string range of  Swift      nil        print  exists         alternative  not case sensitive if string lowercased   range of  swift      nil       print  exists       Older Swift  var string    hello Swift   if string rangeOfString  Swift      nil       println  exists         alternative  not case sensitive if string lowercaseString rangeOfString  swift      nil       println  exists       I hope this is a helpful solution since some people  including me  encountered some strange problems by calling containsString   1  PS  Don t forget to import Foundation  Footnotes   Just remember that using collection functions on Strings has some edge cases which can give you unexpected results  e  g  when dealing with emojis or other grapheme clusters like accented letters

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In Swift 4 2  Use  func contains   str  String  - gt  Bool   Example  let string    hello Swift  let containsSwift   string contains  Swift   print containsSwift     prints true

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Swift 4 way to check for substrings  including the necessary Foundation  or UIKit  framework import    import Foundation    or UIKit  let str    Oh Canada    str contains  Can      returns true  str contains  can      returns false  str lowercased   contains  can      case-insensitive  returns true   Unless Foundation  or UIKit  framework is imported  str contains  Can   will give a compiler error     This answer is regurgitating manojlds s answer  which is completely correct  I have no idea why so many answers go through so much trouble to recreate Foundation s String contains subString  String  method

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You can do this very easily in Swift using the code   let string    hello Swift   let subString    string as NSString  containsString  Swift   if subString  println  Exist

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Xcode 8 Swift 3 version   let string    hello Swift   if let range   string range of   Swift         print  exists at range   range      else       print  does not exist      if let lowercaseRange   string lowercased   range of   swift         print  exists at range   lowercaseRange      else       print  does not exist       You can also use contains   string contains  swift      false string contains  Swift      true

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Just an addendum to the answers here   You can also do a local case insensitive test using     -  BOOL localizedCaseInsensitiveContainsString  NSString   aString   Example       import Foundation      var string  NSString      hello Swift     if string localizedCaseInsensitiveContainsString  Hello         println  TRUE       UPDATE  This is part of the Foundation Framework for iOS  amp  Mac OS X 10 10 x  and was part of 10 10 at Time of my original Posting      Document Generated  2014-06-05 12 26 27 -0700 OS X Release Notes   Copyright    2014 Apple Inc  All Rights Reserved       OS X 10 10 Release Notes Cocoa Foundation Framework      NSString now has the following two convenience methods       -  BOOL containsString  NSString   str       -  BOOL localizedCaseInsensitiveContainsString  NSString   str

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Here you are   let s    hello Swift  if let textRange   s rangeOfString  Swift         NSLog  exists

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As of Xcode 7 1 and Swift 2 1 containsString   is working fine for me   let string    hello swift  if string containsString  swift         print  found swift       Swift 4    let string    hello swift  if string contains  swift         print  found swift       And a case insensitive Swift 4 example    let string    Hello Swift  if string lowercased   contains  swift         print  found swift       Or using a case insensitive String extension   extension String       func containsIgnoreCase   string  String  - gt  Bool           return self lowercased   contains string lowercased             let string    Hello Swift  let stringToFind    SWIFT  if string containsIgnoreCase stringToFind        print  found    stringToFind        found  SWIFT   print  string    string    print  stringToFind    stringToFind        console output  found  SWIFT string  Hello Swift stringToFind  SWIFT

[swift] How do I check if a string contains another string in Swift?

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