Using C to check if string contains a string in string array

Question

I want to use C  to check if a string value contains a word in a string array  For example   string stringToCheck    text1text2text3    string   stringArray      text1    someothertext   etc        if stringToCheck contains stringArray    one of the items         How can I check if the string value for  stringToCheck  contains a word in the  array

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I used the following code to check if the string contained any of the items in the string array   foreach  string s in stringArray        if  s                      if  stringToCheck Contains s                         Text    matched

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If stringArray contains a large number of varied length strings  consider using a Trie to store and search the string array   public static class Extensions       public static bool ContainsAny this string stringToCheck  IEnumerable lt string gt  stringArray                Trie trie   new Trie stringArray           for  int i   0  i  lt  stringToCheck Length    i                        if  trie MatchesPrefix stringToCheck Substring i                                  return true                                   return false            Here is the implementation of the Trie class  public class Trie       public Trie IEnumerable lt string gt  words                Root   new Node   Letter     0             foreach  string word in words                        this Insert word                        public bool MatchesPrefix string sentence                if  sentence    null                        return false                     Node current   Root          foreach  char letter in sentence                        if  current Links ContainsKey letter                                 current   current Links letter                   if  current IsWord                                        return true                                              else                               return false                                   return false             private void Insert string word                if  word    null                        throw new ArgumentNullException                       Node current   Root          foreach  char letter in word                        if  current Links ContainsKey letter                                 current   current Links letter                             else                               Node newNode   new Node   Letter   letter                    current Links Add letter  newNode                   current   newNode                                   current IsWord   true             private class Node               public char Letter          public SortedList lt char  Node gt  Links   new SortedList lt char  Node gt             public bool IsWord             private Node Root      If all strings in stringArray have the same length  you will be better off just using a HashSet instead of a Trie  public static bool ContainsAny this string stringToCheck  IEnumerable lt string gt  stringArray        int stringLength   stringArray First   Length      HashSet lt string gt  stringSet   new HashSet lt string gt  stringArray       for  int i   0  i  lt  stringToCheck Length - stringLength    i                if  stringSet Contains stringToCheck Substring i  stringLength                          return true                       return false

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Try this  string stringToCheck    text1text2text3   string   stringArray   new string      text1      var t   lines ToList   Find c   gt  c Contains stringToCheck      It will return you the line with the first incidence of the text that you are looking for

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Try this   No need to use LINQ  if  Array IndexOf array  Value   gt   0          Your stuff goes here

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Just use linq method   stringArray Contains stringToCheck

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Here s how   if stringArray Any stringToCheck Contains      or a bit longer   stringArray Any s   gt  stringToCheck Contains s         This checks if stringToCheck contains any one of substrings from stringArray  If you want to ensure that it contains all the substrings  change Any to All   if stringArray All stringToCheck Contains

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To complete the above answers  for IgnoreCase check use   stringArray Any s   gt  stringToCheck IndexOf s  StringComparison CurrentCultureIgnoreCase   gt  -1

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Using Find or FindIndex methods of the Array class   if Array Find stringArray  stringToCheck Contains     null          if Array FindIndex stringArray  stringToCheck Contains     -1

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For my case  the above answers did not work  I was checking for a string in an array and assigning it to a boolean value  I modified  Anton Gogolev s answer and removed the Any   method and put the stringToCheck inside the Contains   method   bool   stringArray Contains stringToCheck

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Three options demonstrated   I prefer to find the third as the most concise   class Program       static void Main string   args        string req    PUT       if   new string     PUT    POST    Any s   gt  req Contains s              Console WriteLine  one 1 A        IS TRUE           req    XPUT       if   new string     PUT    POST    Any s   gt  req Contains s              Console WriteLine  one 1 B       IS TRUE           req    PUTX       if   new string     PUT    POST    Any s   gt  req Contains s              Console WriteLine  one 1 C        IS TRUE           req    UT       if   new string     PUT    POST    Any s   gt  req Contains s              Console WriteLine  one 1 D       false           req    PU       if   new string     PUT    POST    Any s   gt  req Contains s              Console WriteLine  one 1 E       false           req    POST       if   new string     PUT    POST    Any s   gt  req Contains s              Console WriteLine  two 1 A       IS TRUE           req    ASD       if   new string     PUT    POST    Any s   gt  req Contains s              Console WriteLine  three 1 A        false             Console WriteLine  -----        req    PUT       if  Array IndexOf  new string     PUT    POST     req   gt   0             Console WriteLine  one 2 A       IS TRUE           req    XPUT       if  Array IndexOf  new string     PUT    POST     req   gt   0             Console WriteLine  one 2 B       false           req    PUTX       if  Array IndexOf  new string     PUT    POST     req   gt   0             Console WriteLine  one 2 C       false           req    UT       if  Array IndexOf  new string     PUT    POST     req   gt   0             Console WriteLine  one 2 D       false           req    PU       if  Array IndexOf  new string     PUT    POST     req   gt   0             Console WriteLine  one 2 E       false           req    POST       if  Array IndexOf  new string     PUT    POST     req   gt   0             Console WriteLine  two 2 A        IS TRUE           req    ASD       if  Array IndexOf  new string     PUT    POST     req   gt   0             Console WriteLine  three 2 A        false            Console WriteLine  -----        req    PUT       if   new string     PUT    POST   Contains req               Console WriteLine  one 3 A       IS TRUE           req    XPUT       if   new string     PUT    POST   Contains req               Console WriteLine  one 3 B        false           req    PUTX       if   new string     PUT    POST   Contains req               Console WriteLine  one 3 C        false           req    UT       if   new string     PUT    POST   Contains req               Console WriteLine  one 3 D        false           req    PU       if   new string     PUT    POST   Contains req               Console WriteLine  one 3 E        false           req    POST       if   new string     PUT    POST   Contains req               Console WriteLine  two 3 A        IS TRUE           req    ASD       if   new string     PUT    POST   Contains req               Console WriteLine  three 3 A        false            Console ReadKey

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Simple solution  not required linq any  String Join      array  Contains Value

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I would use Linq but it still can be done through   new     text1    text2    etc   Contains ItemToFind

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Most of those solution is correct  but if You need check values without case sensitivity using System Linq      string stringToCheck    quot text1text2text3 quot   string   stringArray      quot text1 quot    quot someothertext quot     if stringArray Any a  gt  String Equals a  stringToCheck  StringComparison InvariantCultureIgnoreCase             contains    if  stringArray Any w  gt  w IndexOf stringToCheck  StringComparison InvariantCultureIgnoreCase  gt  0          contains    dotNetFiddle example

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Something like this perhaps   string stringToCheck    text1text2text3   string   stringArray   new string      text1     if  Array Exists lt string gt  stringArray   Predicate lt string gt  delegate string s         return stringToCheck IndexOf s  StringComparison OrdinalIgnoreCase   gt  -1            Console WriteLine  Found

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int result   Array BinarySearch list ToArray    typedString  StringComparer OrdinalIgnoreCase

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I use the following in a console application to check for arguments  var sendmail   args Any  o   gt  o ToLower        sendmail true

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I used a similar method to the IndexOf by Maitrey684 and the foreach loop of Theomax to create this    Note  the first 3  string  lines are just an example of how you could create an array and get it into the proper format      If you want to compare 2 arrays  they will be semi-colon delimited  but the last value won t have one after it   If you append a semi-colon to the string form of the array  i e  a b c becomes a b c    you can match using  x   no matter what position it is in   bool found   false  string someString    a-b-c   string   arrString   someString Split  -    string myStringArray   arrString ToString           foreach  string s in otherArray        if  myStringArray IndexOf s           -1           found   true         break           if  found    true

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stringArray ToList   Contains stringToCheck

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public bool ContainAnyOf string word  string   array                 for  int i   0  i  lt  array Length  i                          if  word Contains array i                                  return true                                  return false

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string    lines     text1    text2    etc     bool bFound   lines Any x   gt  x     Your string to be searched      bFound sets to true if searched string is matched with any element of array  lines

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try this  here the example   To check if the field contains any of the words in the array  To check if the field someField  contains any of the words in the array   String   val      helloword1    orange    grape    pear         Expression lt Func lt Item  bool gt  gt  someFieldFilter   i   gt  true   someFieldFilter   i   gt  val Any s   gt  i someField Contains s

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You can try this solution as well  string   nonSupportedExt      quot  3gp quot    quot  avi quot    quot  opus quot    quot  wma quot    quot  wav quot    quot  m4a quot    quot  ac3 quot    quot  aac quot    quot  aiff quot              bool valid   Array Exists nonSupportedExt E   gt  E     quot  Aac quot  ToLower

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Try this  no need for a loop    string stringToCheck    text1   List lt string gt  stringList   new List lt string gt       text1    someothertext    etc       if  stringList Exists o   gt  stringToCheck Contains o

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You can also do the same thing as Anton Gogolev suggests to check if any item in stringArray1 matches any item in stringArray2   if stringArray1 Any stringArray2 Contains     And likewise all items in stringArray1 match all items in stringArray2   if stringArray1 All stringArray2 Contains

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Using Linq and method group would be the quickest and more compact way of doing this   var arrayA   new     element1    element2    var arrayB   new     element2    element3    if  arrayB Any arrayA Contains   return true

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here is how you can do it   string stringToCheck    text1   string   stringArray      text1    testtest    test1test2    test2text1     foreach  string x in stringArray        if  stringToCheck Contains x                    Process              UPDATE  May be you are looking for a better solution   refer to  Anton Gogolev s answer below which makes use of LINQ

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You can define your own string ContainsAny   and string ContainsAll   methods  As a bonus  I ve even thrown in a string Contains   method that allows for case-insensitive comparison  etc   public static class Extensions       public static bool Contains this string source  string value  StringComparison comp                return source IndexOf value  comp   gt  -1             public static bool ContainsAny this string source  IEnumerable lt string gt  values  StringComparison comp   StringComparison CurrentCulture                return values Any value   gt  source Contains value  comp               public static bool ContainsAll this string source  IEnumerable lt string gt  values  StringComparison comp   StringComparison CurrentCulture                return values All value   gt  source Contains value  comp              You can test these with the following code       public static void TestExtensions                 string   searchTerms      FOO    BAR             string   documents                  Hello foo bar                Hello foo                Hello                      foreach  var document in documents                        Console WriteLine  Testing   0    document               Console WriteLine  ContainsAny   0    document ContainsAny searchTerms  StringComparison OrdinalIgnoreCase                Console WriteLine  ContainsAll   0    document ContainsAll searchTerms  StringComparison OrdinalIgnoreCase                Console WriteLine

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Try   String   val      helloword1    orange    grape    pear     String sep       string stringToCheck    word1    bool match   String Join sep val  Contains stringToCheck   bool anothermatch   val Any s   gt  s Contains stringToCheck

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Easiest and sample way     bool bol Array Exists stringarray E   gt  E    stringtocheck

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string strName    vernie   string   strNamesArray      roger    vernie    joel      if  strNamesArray Any x   gt  x    strName           do some action here if true

[c#] Using C# to check if string contains a string in string array

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