/*
    fast strstr
*/
const char *strstr(const char *str, const char *key);

/*
    strstr(case insensitive version)
    @note key must not have capital characters [A-Z]
*/
const char *strcasestr(const char *str, const char *key);

/*
    find key[0] or key[1], ... in str
    @note strlen(key) <= 16, key[i] != 0
    @note almost same as strbpk excluding restriction with key size
*/
const char *strchr_any(const char *str, const char *key);

/*
    find c such that key[0] <= c && c <= key[1], key[2] <= c && c <= key[3], ... in str
    @note strlen(key) <= 16, key[i] != 0
    @note strchr_range(str, "az09") means to find string with a regular expression [a-z0-9] in str
*/
const char *strchr_range(const char *str, const char *key);

/*
    find c in [begin, end)
    if c is not found then return end
*/
const char *findChar(const char *begin, const char *end, char c);

/*
    find any of key[0..keySize - 1] in [begin, end)
    if char is not found then return end
    @note keySize <= 16
*/
const char *findChar_any(const char *begin, const char *end, const char *key, size_t keySize);

/*
    find character in range [key[0]..key[1]], [key[2]..key[3]], ... in [begin, end)
    if char is not found then return end
    @note keySize <= 16
*/
const char *findChar_range(const char *begin, const char *end, const char *key, size_t keySize);

/*
    find [key, key + keySize) in [begin, end)
*/
const char *findStr(const char*begin, const char *end, const char *key, size_t keySize);

/*
    case insensitive find [key, key + keySize) in [begin, end)
    @note key must not have capital characters [A-Z]
*/
const char *findCaseStr(const char*begin, const char *end, const char *key, size_t keySize);