How do I check if a string contains another string in Objective-C

Question

How can I check if a string  NSString  contains another smaller string   I was hoping for something like   NSString  string     hello bla bla   NSLog    d   string containsSubstring   hello       But the closest I could find was   if   string rangeOfString   hello      0        NSLog   sub string doesnt exist       else       NSLog   exists        Anyway  is that the best way to find if a string contains another string

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Best solution  As simple as this  If you want to find a word or  part of the string  You can use this code  In this example we are going to check if the value of word contains  acter    NSString  word    find a word or character here   if   word containsString   acter         NSLog   It contains acter      else        NSLog    It does not contain acter

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NSString  categoryString     Holiday Event   if  categoryString rangeOfString   Holiday   location    NSNotFound          categoryString does not contains Holiday   else         categoryString contains Holiday

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With iOS 8 and Swift  we can use localizedCaseInsensitiveContainsString  method     let string  NSString    Caf     let substring  NSString          string localizedCaseInsensitiveContainsString substring     true

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- Bool checkIf  String parentString containsSubstring  String checkString       NSRange textRange   parentString rangeOfString checkString       return textRange location    NSNotFound    returns true if parent string contains substring else returns false

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NSString  myString     hello bla bla   NSRange rangeValue    myString rangeOfString   hello  options NSCaseInsensitiveSearch    if  rangeValue length  gt  0        NSLog   string contains hello       else        NSLog   string does not contain hello           You can alternatively use following too    if  rangeValue location    NSNotFound         NSLog   string does not contain hello       else        NSLog   string contains hello

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Here is a copy-and-paste function snippet   - BOOL Contains  NSString   StrSearchTerm on  NSString   StrText       return  StrText rangeOfString StrSearchTerm          options NSCaseInsensitiveSearch  location    NSNotFound

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Since this seems to be a high-ranking result in Google  I want to add this   iOS 8 and OS X 10 10 add the containsString  method to NSString  An updated version of Dave DeLong s example for those systems   NSString  string     hello bla bla   if   string containsString   bla          NSLog   string contains bla       else       NSLog   string does not contain bla

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If certain position of the string is needed  this code comes to place in Swift 3 0   let string    This is my string  let substring    my   let position   string range of  substring   lowerBound

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NSString  string     hello bla bla   if   string rangeOfString   bla   location    NSNotFound      NSLog   string does not contain bla      else     NSLog   string contains bla         The key is noticing that rangeOfString  returns an NSRange struct  and the documentation says that it returns the struct  NSNotFound  0  if the  haystack  does not contain the  needle      And if you re on iOS 8 or OS X Yosemite  you can now do    NOTE  This WILL crash your app if this code is called on an iOS7 device    NSString  string     hello bla blah   if   string containsString   bla        NSLog   string contains bla       else     NSLog   string does not contain bla         This is also how it would work in Swift

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If you need this once write   NSString  stringToSearchThrough     -rangeOfString method finds and returns the range of the first occurrence of a given string within the receiver    BOOL contains    stringToSearchThrough rangeOfString   occurence of a given string   location    NSNotFound

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Try this    Swift 4 1   4 2   let stringData    Black board     swift quick way and case sensitive if stringData contains  bla         print  data contains string         case sensitive if stringData range of   bla  options   caseInsensitive     nil       print  data contains string     else       print  data does not contains string        For Objective-C   NSString  stringData     Black board      Quick way and case sensitive if   stringData containsString   bla          NSLog   data contains string         Case Insensitive if   stringData rangeOfString   bla  options NSCaseInsensitiveSearch  location    NSNotFound       NSLog   data contains string     else      NSLog   data does not contain string

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If do not bother about case-sensitive string   Try this once   NSString  string      Hello World     if  string rangeOfString   hello  options NSCaseInsensitiveSearch  location   NSNotFound        NSLog   found      else       NSLog   not found

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Please use this code  NSString  string     hello bla bla   if   string rangeOfString   bla   location    NSNotFound         NSLog   string does not contain bla       else          NSLog   string contains bla

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In case of swift  this can be used   let string    Package  23  if string containsString  Package             String contains substring   else         String does not contain substring

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Use the option NSCaseInsensitiveSearch with rangeOfString options   NSString  me     toBe    NSString  target     abcdetobe    NSRange range    target  rangeOfString  me options  NSCaseInsensitiveSearch   NSLog   found        range location    NSNotFound      Yes      No    if  range location    NSNotFound       your code     Output result is found Yes  The options can be  or ed  together and include   NSCaseInsensitiveSearch NSLiteralSearch NSBackwardsSearch and more

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An improved version of P i s solution  a category on NSString  that not only will tell  if a string is found within another string  but also takes a range by reference  is    interface NSString  Contains  - BOOL containsString   NSString  substring               atRange  NSRange  range   - BOOL containsString  NSString   substring   end   implementation NSString  Contains   - BOOL containsString  NSString   substring               atRange  NSRange   range       NSRange r    self rangeOfString   substring       BOOL found     r location    NSNotFound        if  range    NULL   range   r      return found     - BOOL containsString  NSString   substring       return  self containsString substring                         atRange NULL       end   Use it like   NSString  string     Hello  World       If you only want to ensure a string contains a certain substring if   string containsString   ello  atRange NULL         NSLog   YES          Or simply if   string containsString   ello          NSLog   YES         If you also want to know substring s range NSRange range  if   string containsString   ello  atRange  amp range         NSLog        NSStringFromRange range

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try this   NSString  string     test Data   if    string lowercaseString  rangeOfString   data   location    NSNotFound         NSLog   string does not contain Data         else        NSLog   string contains data

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Oneliner  Smaller amount of code  DRY  as you have only one NSLog      NSString  string     hello bla bla   NSLog   String        string rangeOfString   bla   location    NSNotFound      not found      cotains bla

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Swift 4 And Above  let str    Hello iam midhun   if str contains  iam         contains substring   else       doesn t contain substring     Objective-C  NSString  stringData     Hello iam midhun    if   stringData containsString   iam            contains substring   else         doesn t contain substring

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For iOS 8 0  and macOS 10 10   you can use NSString s native containsString    For older versions of iOS and macOS  you can create your own  obsolete  category for NSString    interface NSString   SubstringSearch       -  BOOL containsString  NSString   substring   end     - - - -    implementation NSString   SubstringSearch    -  BOOL containsString  NSString   substring           NSRange range    self rangeOfString   substring       BOOL found     range location    NSNotFound        return found      end   Note  Observe Daniel Galasko s comment below regarding naming

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First string contain or not second string   NSString  first     Banana   NSString  second     BananaMilk   NSRange range    first rangeOfString second options NSCaseInsensitiveSearch    if  range length  gt  0        NSLog   Detected      else       NSLog   Not detected

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So personally I really hate NSNotFound but understand its necessity   But some people may not understand the complexities of comparing against NSNotFound  For example  this code   -  BOOL doesString  NSString  string containString  NSString  otherString       if  string rangeOfString otherString  location    NSNotFound          return YES      else         return NO      has its problems   1  Obviously if otherString   nil this code will crash   a simple test would be   NSLog   does string contain string -       self doesString   hey  containString nil      YES     NO      results in     CRASH     2  What is not so obvious to someone new to objective-c is that the same code will NOT crash when string   nil   For example  this code   NSLog   does string contain string -       self doesString nil containString   hey       YES     NO      and this code   NSLog   does string contain string -       self doesString nil containString nil      YES     NO      will both result in  does string contains string - YES   Which is clearly NOT what you want   So the better solution that I believe works is to use the fact that rangeOfString returns the length of 0  so then a better more reliable code is this   -  BOOL doesString  NSString  string containString  NSString  otherString       if otherString  amp  amp   string rangeOfString otherString  length          return YES      else         return NO      OR SIMPLY   -  BOOL doesString  NSString  string containString  NSString  otherString       return  otherString  amp  amp   string rangeOfString otherString  length       which will for cases  1 and 2 will return  does string contains string - NO   That s my 2 cents  -   Please check out my Gist for more helpful code

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In Swift 4   let a    Hello  how are you   a contains  Hello       will return true

[ios] How do I check if a string contains another string in Objective-C?

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