How do you know if two strings are equal not case sensitive?

equalsIgnoreCase() : The String. equalsIgnoreCase() method compares two strings irrespective of the case (lower or upper) of the string. This method returns true if the argument is not null and the contents of both the Strings are same ignoring case, else false.

Examples. The right way of comparing String in Java is to either use equals(), equalsIgnoreCase(), or compareTo() method . You should use equals() method to check if two String contains exactly same characters in same order. It returns true if two String are equal or false if unequal.

It is case-insensitive . The behavior is NOT undefined (it is well-defined) if either string is a null ptr. Regular strncmp() has undefined behavior if either string is a null ptr (see: https://en.cppreference.com/w/cpp/string/byte/strncmp).

Problem. A string comparison is case sensitive when you don’t want it to be, or vice versa .

Method 1: Naive Approach

Finding A Case Insensitive Sub String in C++ using STL