Case insensitive Contains string

Question

Is there a way to make the following return true   string title    ASTRINGTOTEST   title Contains  string      There doesn t seem to be an overload that allows me to set the case sensitivity   Currently I UPPERCASE them both  but that s just silly  by which I am referring to the i18n issues that come with up- and down casing    UPDATE This question is ancient and since then I have realized I asked for a simple answer for a really vast and difficult topic if you care to investigate it fully  For most cases  in mono-lingual  English code bases this answer will suffice  I m suspecting because most people coming here fall in this category this is the most popular answer  This answer however brings up the inherent problem that we can t compare text case insensitive until we know both texts are the same culture and we know  what that culture is  This is maybe a less popular answer  but I think it is more correct and that s why I marked it as such

User · Answer

Using a RegEx is a straight way to do this   Regex IsMatch title   string   RegexOptions IgnoreCase

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I know that this is not the C   but in the framework  VB NET  there is already such a function  Dim str As String    UPPERlower  Dim b As Boolean   InStr str   UpperLower     C  variant   string myString    Hello World   bool contains   Microsoft VisualBasic Strings InStr myString   world

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Using a RegEx is a straight way to do this   Regex IsMatch title   string   RegexOptions IgnoreCase

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Based on the existing answers and on the documentation of Contains method I would recommend the creation of the following extension which also takes care of the corner cases  public static class VStringExtensions        public static bool Contains this string source  string toCheck  StringComparison comp                 if  toCheck    null                         throw new ArgumentNullException nameof toCheck                       if  source Equals string Empty                          return false                     if  toCheck Equals string Empty                          return true                     return source IndexOf toCheck  comp   gt   0

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These are the easiest solutions    By Index of  string title    STRING    if  title IndexOf  string   0  StringComparison CurrentCultureIgnoreCase     -1           contains     By Changing case  string title    STRING    bool contains   title ToLower   Contains  string    By Regex  Regex IsMatch title   string   RegexOptions IgnoreCase

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The trick here is to look for the string  ignoring case  but to keep it exactly the same  with the same case     var s  Factory Reset    var txt  reset    int first   s IndexOf txt  StringComparison InvariantCultureIgnoreCase    txt Length   var subString   s Substring first - txt Length  txt Length     Output is  Reset

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The trick here is to look for the string  ignoring case  but to keep it exactly the same  with the same case     var s  Factory Reset    var txt  reset    int first   s IndexOf txt  StringComparison InvariantCultureIgnoreCase    txt Length   var subString   s Substring first - txt Length  txt Length     Output is  Reset

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Just like this   string s  AbcdEf   if s ToLower   Contains  def          Console WriteLine  yes

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You could use the String IndexOf Method and pass StringComparison OrdinalIgnoreCase as the type of search to use   string title    STRING   bool contains   title IndexOf  string   StringComparison OrdinalIgnoreCase   gt   0    Even better is defining a new extension method for string   public static class StringExtensions       public static bool Contains this string source  string toCheck  StringComparison comp                return source  IndexOf toCheck  comp   gt   0            Note  that null propagation    is available since C  6 0  VS 2015   for older versions use  if  source    null  return false  return source IndexOf toCheck  comp   gt   0    USAGE     string title    STRING   bool contains   title Contains  string   StringComparison OrdinalIgnoreCase

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You could use the String IndexOf Method and pass StringComparison OrdinalIgnoreCase as the type of search to use   string title    STRING   bool contains   title IndexOf  string   StringComparison OrdinalIgnoreCase   gt   0    Even better is defining a new extension method for string   public static class StringExtensions       public static bool Contains this string source  string toCheck  StringComparison comp                return source  IndexOf toCheck  comp   gt   0            Note  that null propagation    is available since C  6 0  VS 2015   for older versions use  if  source    null  return false  return source IndexOf toCheck  comp   gt   0    USAGE     string title    STRING   bool contains   title Contains  string   StringComparison OrdinalIgnoreCase

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You can use IndexOf   like this   string title    STRING    if  title IndexOf  string   0  StringComparison CurrentCultureIgnoreCase     -1           The string exists in the original     Since 0  zero  can be an index  you check against -1   MSDN     The zero-based index position of value if that string is found  or -1   if it is not  If value is String Empty  the return value is 0

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Based on the existing answers and on the documentation of Contains method I would recommend the creation of the following extension which also takes care of the corner cases  public static class VStringExtensions        public static bool Contains this string source  string toCheck  StringComparison comp                 if  toCheck    null                         throw new ArgumentNullException nameof toCheck                       if  source Equals string Empty                          return false                     if  toCheck Equals string Empty                          return true                     return source IndexOf toCheck  comp   gt   0

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One issue with the answer is that it will throw an exception if a string is null  You can add that as a check so it won t   public static bool Contains this string source  string toCheck  StringComparison comp        if  string IsNullOrEmpty toCheck     string IsNullOrEmpty source           return true       return source IndexOf toCheck  comp   gt   0

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You can use string indexof    function  This will be case insensitive

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StringExtension class is the way forward  I ve combined a couple of the posts above to give a complete code example   public static class StringExtensions            lt summary gt          Allows case insensitive checks          lt  summary gt      public static bool Contains this string source  string toCheck  StringComparison comp                return source IndexOf toCheck  comp   gt   0

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This is quite similar to other example here  but I ve decided to simplify enum to bool  primary because other alternatives are normally not needed  Here is my example   public static class StringExtensions       public static bool Contains this string source  string toCheck  bool bCaseInsensitive                 return source IndexOf toCheck  bCaseInsensitive   StringComparison OrdinalIgnoreCase   StringComparison Ordinal   gt   0            And usage is something like   if   main String substring  Contains  SUBSTRING   true

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OrdinalIgnoreCase  CurrentCultureIgnoreCase or InvariantCultureIgnoreCase   Since this is missing  here are some recommendations about when to use which one   Dos   Use StringComparison OrdinalIgnoreCase for comparisons as your safe default for culture-agnostic string matching  Use StringComparison OrdinalIgnoreCase comparisons for increased speed  Use StringComparison CurrentCulture-based string operations when displaying the output to the user  Switch current use of string operations based on the invariant culture to use the non-linguistic StringComparison Ordinal or      StringComparison OrdinalIgnoreCase when the comparison is linguistically irrelevant  symbolic  for example    Use ToUpperInvariant rather than ToLowerInvariant when normalizing strings for comparison    Don ts   Use overloads for string operations that don t explicitly or implicitly specify the string comparison mechanism  Use StringComparison InvariantCulture -based string operations in most cases  one of the few exceptions would be persisting linguistically meaningful but culturally-agnostic data      Based on these rules you should use   string title    STRING   if  title IndexOf  string   0  StringComparison  YourDecision      -1           The string exists in the original     whereas  YourDecision  depends on the recommendations from above   link of source  http   msdn microsoft com en-us library ms973919 aspx

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You can use a string comparison parameter  available from  net 2 1 and above   String Contains Method  public bool Contains  string value  StringComparison comparisonType    Example  string title    quot ASTRINGTOTEST quot   title Contains  quot string quot   StringComparison InvariantCultureIgnoreCase

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You can use IndexOf   like this   string title    STRING    if  title IndexOf  string   0  StringComparison CurrentCultureIgnoreCase     -1           The string exists in the original     Since 0  zero  can be an index  you check against -1   MSDN     The zero-based index position of value if that string is found  or -1   if it is not  If value is String Empty  the return value is 0

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Just like this   string s  AbcdEf   if s ToLower   Contains  def          Console WriteLine  yes

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NET Core 2 0  only  as of now    NET Core has had a pair of methods to deal with this since version 2 0     String Contains Char  StringComparison  String Contains String  StringComparison    Example    Test  Contains  test   System StringComparison CurrentCultureIgnoreCase     In time  they will probably make their way into the  NET Standard and  from there  into all the other implementations of the Base Class Library

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I know that this is not the C   but in the framework  VB NET  there is already such a function  Dim str As String    UPPERlower  Dim b As Boolean   InStr str   UpperLower     C  variant   string myString    Hello World   bool contains   Microsoft VisualBasic Strings InStr myString   world

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Similar to previous answers  using an extension method  but with two simple null checks  C  6 0 and above   public static bool ContainsIgnoreCase this string source  string substring        return source  IndexOf substring     quot  quot   StringComparison OrdinalIgnoreCase   gt   0     If source is null  return false  via null-propagation operator     If substring is null  treat as an empty string and return true  via null-coalescing operator     The StringComparison can of course be sent as a parameter if needed

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if you want to check if your passed string is in string then there is a simple method for that   string yourStringForCheck   abc   string stringInWhichWeCheck   Test abc abc    bool isContained   stringInWhichWeCheck ToLower   IndexOf yourStringForCheck ToLower     gt  -1    This boolean value will return if the string is contained or not

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To test if the string paragraph contains the string word  thanks  QuarterMeister   culture CompareInfo IndexOf paragraph  word  CompareOptions IgnoreCase   gt   0   Where culture is the instance of CultureInfo describing the language that the text is written in   This solution is transparent about the definition of case-insensitivity  which is language dependent  For example  the English language uses the characters I and i for the upper and lower case versions of the ninth letter  whereas the Turkish language uses these characters for the eleventh and twelfth letters of its 29 letter-long alphabet  The Turkish upper case version of  i  is the unfamiliar character  I    Thus the strings tin and TIN are the same word in English  but different words in Turkish  As I understand  one means  spirit  and the other is an onomatopoeia word   Turks  please correct me if I m wrong  or suggest a better example   To summarise  you can only answer the question  are these two strings the same but in different cases  if you know what language the text is in  If you don t know  you ll have to take a punt  Given English s hegemony in software  you should probably resort to CultureInfo InvariantCulture  because it ll be wrong in familiar ways

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As simple and works   title ToLower   Contains  String  ToLower

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The InStr method from the VisualBasic assembly is the best if you have a concern about internationalization  or you could reimplement it    Looking at in it dotNeetPeek shows that not only does it account for caps and lowercase  but also for kana type and full- vs  half-width characters  mostly relevant for Asian languages  although there are full-width versions of the Roman alphabet too    I m skipping over some details  but check out the private method InternalInStrText   private static int InternalInStrText int lStartPos  string sSrc  string sFind      int num   sSrc    null   0   sSrc Length    if  lStartPos  gt  num    num    0      return -1    if  sFind    null    sFind Length    0      return lStartPos    else     return Utils GetCultureInfo   CompareInfo IndexOf sSrc  sFind  lStartPos  CompareOptions IgnoreCase   CompareOptions IgnoreKanaType   CompareOptions IgnoreWidth

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This is clean and simple   Regex IsMatch file  fileNamestr  RegexOptions IgnoreCase

User · Answer

These are the easiest solutions    By Index of  string title    STRING    if  title IndexOf  string   0  StringComparison CurrentCultureIgnoreCase     -1           contains     By Changing case  string title    STRING    bool contains   title ToLower   Contains  string    By Regex  Regex IsMatch title   string   RegexOptions IgnoreCase

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Alternative solution using Regex   bool contains   Regex IsMatch  StRiNG to search   Regex Escape  string    RegexOptions IgnoreCase

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OrdinalIgnoreCase  CurrentCultureIgnoreCase or InvariantCultureIgnoreCase   Since this is missing  here are some recommendations about when to use which one   Dos   Use StringComparison OrdinalIgnoreCase for comparisons as your safe default for culture-agnostic string matching  Use StringComparison OrdinalIgnoreCase comparisons for increased speed  Use StringComparison CurrentCulture-based string operations when displaying the output to the user  Switch current use of string operations based on the invariant culture to use the non-linguistic StringComparison Ordinal or      StringComparison OrdinalIgnoreCase when the comparison is linguistically irrelevant  symbolic  for example    Use ToUpperInvariant rather than ToLowerInvariant when normalizing strings for comparison    Don ts   Use overloads for string operations that don t explicitly or implicitly specify the string comparison mechanism  Use StringComparison InvariantCulture -based string operations in most cases  one of the few exceptions would be persisting linguistically meaningful but culturally-agnostic data      Based on these rules you should use   string title    STRING   if  title IndexOf  string   0  StringComparison  YourDecision      -1           The string exists in the original     whereas  YourDecision  depends on the recommendations from above   link of source  http   msdn microsoft com en-us library ms973919 aspx

User · Answer

Just convert the string to uppercase or to lower case to match the search criteria  i e  string title    quot ASTRINGTOTEST quot   title ToLower   Contains  quot string quot

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You could use the String IndexOf Method and pass StringComparison OrdinalIgnoreCase as the type of search to use   string title    STRING   bool contains   title IndexOf  string   StringComparison OrdinalIgnoreCase   gt   0    Even better is defining a new extension method for string   public static class StringExtensions       public static bool Contains this string source  string toCheck  StringComparison comp                return source  IndexOf toCheck  comp   gt   0            Note  that null propagation    is available since C  6 0  VS 2015   for older versions use  if  source    null  return false  return source IndexOf toCheck  comp   gt   0    USAGE     string title    STRING   bool contains   title Contains  string   StringComparison OrdinalIgnoreCase

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NET Core 2 0  only  as of now    NET Core has had a pair of methods to deal with this since version 2 0     String Contains Char  StringComparison  String Contains String  StringComparison    Example    Test  Contains  test   System StringComparison CurrentCultureIgnoreCase     In time  they will probably make their way into the  NET Standard and  from there  into all the other implementations of the Base Class Library

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You can use IndexOf   like this   string title    STRING    if  title IndexOf  string   0  StringComparison CurrentCultureIgnoreCase     -1           The string exists in the original     Since 0  zero  can be an index  you check against -1   MSDN     The zero-based index position of value if that string is found  or -1   if it is not  If value is String Empty  the return value is 0

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Use this   string Compare  string    STRING   new System Globalization CultureInfo  en-US    System Globalization CompareOptions IgnoreCase

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You can use a string comparison parameter  available from  net 2 1 and above   String Contains Method  public bool Contains  string value  StringComparison comparisonType    Example  string title    quot ASTRINGTOTEST quot   title Contains  quot string quot   StringComparison InvariantCultureIgnoreCase

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Just convert the string to uppercase or to lower case to match the search criteria  i e  string title    quot ASTRINGTOTEST quot   title ToLower   Contains  quot string quot

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You could always just up or downcase the strings first     string title    string   title ToUpper   Contains  STRING       returns true   Oops  just saw that last bit   A case insensitive compare would  probably  do the same anyway  and if performance is not an issue  I don t see a problem with creating uppercase copies and comparing those   I could have sworn that I once saw a case-insensitive compare once

User · Answer

You can use string indexof    function  This will be case insensitive

User · Answer

StringExtension class is the way forward  I ve combined a couple of the posts above to give a complete code example   public static class StringExtensions            lt summary gt          Allows case insensitive checks          lt  summary gt      public static bool Contains this string source  string toCheck  StringComparison comp                return source IndexOf toCheck  comp   gt   0

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Alternative solution using Regex   bool contains   Regex IsMatch  StRiNG to search   Regex Escape  string    RegexOptions IgnoreCase

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Simple way for newbie   title ToLower   Contains  string     of course  string  is lowercase

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public static class StringExtension        region Public Methods      public static bool ExContains this string fullText  string value                return ExIndexOf fullText  value   gt  -1             public static bool ExEquals this string text  string textToCompare                return text Equals textToCompare  StringComparison OrdinalIgnoreCase              public static bool ExHasAllEquals this string text  params string   textArgs                for  int index   0  index  lt  textArgs Length  index                if  ExEquals text  textArgs index      false  return false          return true             public static bool ExHasEquals this string text  params string   textArgs                for  int index   0  index  lt  textArgs Length  index                if  ExEquals text  textArgs index    return true          return false             public static bool ExHasNoEquals this string text  params string   textArgs                return ExHasEquals text  textArgs     false             public static bool ExHasNotAllEquals this string text  params string   textArgs                for  int index   0  index  lt  textArgs Length  index                if  ExEquals text  textArgs index    return false          return true                  lt summary gt          Reports the zero-based index of the first occurrence of the specified string         in the current System String object using StringComparison InvariantCultureIgnoreCase          A parameter specifies the type of search to use for the specified string           lt  summary gt           lt param name  fullText  gt          The string to search inside           lt  param gt           lt param name  value  gt          The string to seek           lt  param gt           lt returns gt          The index position of the value parameter if that string is found  or -1 if it         is not  If value is System String Empty  the return value is 0           lt  returns gt           lt exception cref  ArgumentNullException  gt          fullText or value is null           lt  exception gt      public static int ExIndexOf this string fullText  string value                return fullText IndexOf value  StringComparison OrdinalIgnoreCase              public static bool ExNotEquals this string text  string textToCompare                return ExEquals text  textToCompare     false              endregion Public Methods

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Just to build on the answer here  you can create a string extension method to make this a little more user-friendly       public static bool ContainsIgnoreCase this string paragraph  string word                return CultureInfo CurrentCulture CompareInfo IndexOf paragraph  word  CompareOptions IgnoreCase   gt   0

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You can use IndexOf   like this   string title    STRING    if  title IndexOf  string   0  StringComparison CurrentCultureIgnoreCase     -1           The string exists in the original     Since 0  zero  can be an index  you check against -1   MSDN     The zero-based index position of value if that string is found  or -1   if it is not  If value is String Empty  the return value is 0

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if you want to check if your passed string is in string then there is a simple method for that   string yourStringForCheck   abc   string stringInWhichWeCheck   Test abc abc    bool isContained   stringInWhichWeCheck ToLower   IndexOf yourStringForCheck ToLower     gt  -1    This boolean value will return if the string is contained or not

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This is clean and simple   Regex IsMatch file  fileNamestr  RegexOptions IgnoreCase

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if   strcmpstring1  IndexOf Convert ToString  strcmpstring2    StringComparison CurrentCultureIgnoreCase   gt   0  return true  else return false

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Similar to previous answers  using an extension method  but with two simple null checks  C  6 0 and above   public static bool ContainsIgnoreCase this string source  string substring        return source  IndexOf substring     quot  quot   StringComparison OrdinalIgnoreCase   gt   0     If source is null  return false  via null-propagation operator     If substring is null  treat as an empty string and return true  via null-coalescing operator     The StringComparison can of course be sent as a parameter if needed

User · Answer

You could always just up or downcase the strings first     string title    string   title ToUpper   Contains  STRING       returns true   Oops  just saw that last bit   A case insensitive compare would  probably  do the same anyway  and if performance is not an issue  I don t see a problem with creating uppercase copies and comparing those   I could have sworn that I once saw a case-insensitive compare once

User · Answer

Just to build on the answer here  you can create a string extension method to make this a little more user-friendly       public static bool ContainsIgnoreCase this string paragraph  string word                return CultureInfo CurrentCulture CompareInfo IndexOf paragraph  word  CompareOptions IgnoreCase   gt   0

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public static class StringExtension        region Public Methods      public static bool ExContains this string fullText  string value                return ExIndexOf fullText  value   gt  -1             public static bool ExEquals this string text  string textToCompare                return text Equals textToCompare  StringComparison OrdinalIgnoreCase              public static bool ExHasAllEquals this string text  params string   textArgs                for  int index   0  index  lt  textArgs Length  index                if  ExEquals text  textArgs index      false  return false          return true             public static bool ExHasEquals this string text  params string   textArgs                for  int index   0  index  lt  textArgs Length  index                if  ExEquals text  textArgs index    return true          return false             public static bool ExHasNoEquals this string text  params string   textArgs                return ExHasEquals text  textArgs     false             public static bool ExHasNotAllEquals this string text  params string   textArgs                for  int index   0  index  lt  textArgs Length  index                if  ExEquals text  textArgs index    return false          return true                  lt summary gt          Reports the zero-based index of the first occurrence of the specified string         in the current System String object using StringComparison InvariantCultureIgnoreCase          A parameter specifies the type of search to use for the specified string           lt  summary gt           lt param name  fullText  gt          The string to search inside           lt  param gt           lt param name  value  gt          The string to seek           lt  param gt           lt returns gt          The index position of the value parameter if that string is found  or -1 if it         is not  If value is System String Empty  the return value is 0           lt  returns gt           lt exception cref  ArgumentNullException  gt          fullText or value is null           lt  exception gt      public static int ExIndexOf this string fullText  string value                return fullText IndexOf value  StringComparison OrdinalIgnoreCase              public static bool ExNotEquals this string text  string textToCompare                return ExEquals text  textToCompare     false              endregion Public Methods

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Use this   string Compare  string    STRING   new System Globalization CultureInfo  en-US    System Globalization CompareOptions IgnoreCase

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if   strcmpstring1  IndexOf Convert ToString  strcmpstring2    StringComparison CurrentCultureIgnoreCase   gt   0  return true  else return false

User · Answer

The InStr method from the VisualBasic assembly is the best if you have a concern about internationalization  or you could reimplement it    Looking at in it dotNeetPeek shows that not only does it account for caps and lowercase  but also for kana type and full- vs  half-width characters  mostly relevant for Asian languages  although there are full-width versions of the Roman alphabet too    I m skipping over some details  but check out the private method InternalInStrText   private static int InternalInStrText int lStartPos  string sSrc  string sFind      int num   sSrc    null   0   sSrc Length    if  lStartPos  gt  num    num    0      return -1    if  sFind    null    sFind Length    0      return lStartPos    else     return Utils GetCultureInfo   CompareInfo IndexOf sSrc  sFind  lStartPos  CompareOptions IgnoreCase   CompareOptions IgnoreKanaType   CompareOptions IgnoreWidth

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You could always just up or downcase the strings first     string title    string   title ToUpper   Contains  STRING       returns true   Oops  just saw that last bit   A case insensitive compare would  probably  do the same anyway  and if performance is not an issue  I don t see a problem with creating uppercase copies and comparing those   I could have sworn that I once saw a case-insensitive compare once

User · Answer

To test if the string paragraph contains the string word  thanks  QuarterMeister   culture CompareInfo IndexOf paragraph  word  CompareOptions IgnoreCase   gt   0   Where culture is the instance of CultureInfo describing the language that the text is written in   This solution is transparent about the definition of case-insensitivity  which is language dependent  For example  the English language uses the characters I and i for the upper and lower case versions of the ninth letter  whereas the Turkish language uses these characters for the eleventh and twelfth letters of its 29 letter-long alphabet  The Turkish upper case version of  i  is the unfamiliar character  I    Thus the strings tin and TIN are the same word in English  but different words in Turkish  As I understand  one means  spirit  and the other is an onomatopoeia word   Turks  please correct me if I m wrong  or suggest a better example   To summarise  you can only answer the question  are these two strings the same but in different cases  if you know what language the text is in  If you don t know  you ll have to take a punt  Given English s hegemony in software  you should probably resort to CultureInfo InvariantCulture  because it ll be wrong in familiar ways

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One issue with the answer is that it will throw an exception if a string is null  You can add that as a check so it won t   public static bool Contains this string source  string toCheck  StringComparison comp        if  string IsNullOrEmpty toCheck     string IsNullOrEmpty source           return true       return source IndexOf toCheck  comp   gt   0

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You could always just up or downcase the strings first     string title    string   title ToUpper   Contains  STRING       returns true   Oops  just saw that last bit   A case insensitive compare would  probably  do the same anyway  and if performance is not an issue  I don t see a problem with creating uppercase copies and comparing those   I could have sworn that I once saw a case-insensitive compare once

User · Answer

This is quite similar to other example here  but I ve decided to simplify enum to bool  primary because other alternatives are normally not needed  Here is my example   public static class StringExtensions       public static bool Contains this string source  string toCheck  bool bCaseInsensitive                 return source IndexOf toCheck  bCaseInsensitive   StringComparison OrdinalIgnoreCase   StringComparison Ordinal   gt   0            And usage is something like   if   main String substring  Contains  SUBSTRING   true

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As simple and works   title ToLower   Contains  String  ToLower

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You could use the String IndexOf Method and pass StringComparison OrdinalIgnoreCase as the type of search to use   string title    STRING   bool contains   title IndexOf  string   StringComparison OrdinalIgnoreCase   gt   0    Even better is defining a new extension method for string   public static class StringExtensions       public static bool Contains this string source  string toCheck  StringComparison comp                return source  IndexOf toCheck  comp   gt   0            Note  that null propagation    is available since C  6 0  VS 2015   for older versions use  if  source    null  return false  return source IndexOf toCheck  comp   gt   0    USAGE     string title    STRING   bool contains   title Contains  string   StringComparison OrdinalIgnoreCase

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Simple way for newbie   title ToLower   Contains  string     of course  string  is lowercase

[c#] Case insensitive 'Contains(string)'

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