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How do I make a case insensitive compare between two Unicode characters or strings under Windows in C/C++?

By : ericsorgar
Date : October 14 2020, 01:41 PM
will be helpful for those in need My first thought is that you should lookup CompareStringEx with its parameters LOCALE_INVARIANT and NORM_IGNORECASE.
code :

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SQL Server Collation to match Java case insensitive Unicode compare

By : Hannes Keeve
Date : March 29 2020, 07:55 AM
hop of those help? The simple answer to this question is "No" - there is no collation that orders characters the way you want.

How to compare strings with case insensitive and accent insensitive

By : Abdel
Date : March 29 2020, 07:55 AM
Hope this helps To ignore both case AND accents, you can use string.Compare() with both the IgnoreNonSpace AND the IgnoreCase options, like so:
code :
string s1 = "http://www.buroteknik.com/metylan-c387c4b0ft-tarafli-bant-12cm-x25mt_154202.html";
string s2 = "http://www.buroteknik.com/METYLAN-C387C4B0FT-TARAFLI-BANT-12cm-x25mt_154202.html";
string s3 = "http://www.buroteknik.com/METYLAN-C387C4B0FT-TARAFLı-BANT-12cm-x25mt_154202.html";

Console.WriteLine(string.Compare(s1, s2, CultureInfo.CurrentCulture, CompareOptions.IgnoreNonSpace | CompareOptions.IgnoreCase));
Console.WriteLine(string.Compare(s2, s3, CultureInfo.CurrentCulture, CompareOptions.IgnoreNonSpace | CompareOptions.IgnoreCase));
string s1 = "tarafli";
string s2 = "TARAFLİ";
Console.WriteLine(string.Compare(s1, s2, CultureInfo.CurrentCulture, CompareOptions.IgnoreNonSpace | CompareOptions.IgnoreCase));
string s1 = "tarafli";
string s2 = "TARAFLİ";

var trlocale = CultureInfo.GetCultureInfo("tr-TR");
Console.WriteLine(string.Compare(s1, s2, trlocale, CompareOptions.IgnoreNonSpace | CompareOptions.IgnoreCase));

How to compare strings at C# like in SQL server case insensitive and accent insensitive

By : David Flanagan
Date : March 29 2020, 07:55 AM
may help you . Alright here 4 words which are equal at SQL server Latin1_General_100_CI_AI collation which is case insensitive and accent insensitive , This compares all those strings as equal:
code :
               CompareOptions.IgnoreNonSpace | CompareOptions.IgnoreCase)

How do I compare strings (insensitive case), while inserting same strings into a binary Tree (sensitive case)?

By : Lucan
Date : March 29 2020, 07:55 AM
will be helpful for those in need Rather than use std::string's <, you can use a case insensitive comparison.
code :
bool ci_less(const std::string & lhs, const std::string & rhs) {
    return std::lexicographical_compare(lhs.begin(), lhs.end(), rhs.begin(), rhs.end(), [](char l, char r){ return std::to_lower(l) < std::tolower(r); });

TreeNode* Tree::insert(TreeNode* node, std::string value) {

    if (node == nullptr) {
        return newTreeNode(std::move(value));
    if (ci_less(node->data, value)) {
        node->left = insert(node->left, std::move(value));
    else if(ci_less(value, node->data)) {
        node->right = insert(node->right, std::move(value));
    else {
        return node;
    node->height = 1 + max(height(node->left), height(node->right));
    return node;
struct ci_char_traits : public std::char_traits<char> {
    static char to_upper(char ch) {
        return std::toupper((unsigned char) ch);
    static bool eq(char c1, char c2) {
         return to_upper(c1) == to_upper(c2);
    static bool lt(char c1, char c2) {
         return to_upper(c1) <  to_upper(c2);
    static int compare(const char* s1, const char* s2, size_t n) {
        while ( n-- != 0 ) {
            if ( to_upper(*s1) < to_upper(*s2) ) return -1;
            if ( to_upper(*s1) > to_upper(*s2) ) return 1;
            ++s1; ++s2;
        return 0;
    static const char* find(const char* s, int n, char a) {
        auto const ua (to_upper(a));
        while ( n-- != 0 ) 
            if (to_upper(*s) == ua)
                return s;
        return nullptr;

using ci_string = std::basic_string<char, ci_char_traits>;

How to compare two case insensitive strings?

By : Tenzin_Programmer
Date : March 29 2020, 07:55 AM
I wish did fix the issue. If you look up caseInsensitiveCompare: in the docs you'll see that it returns an NSComparisonResult rather than a BOOL. Look that up in the docs and you'll see that you probably want it to be NSOrderedSame. So
if ([myString1 caseInsensitiveCompare:myString2] == NSOrderedSame)
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