Ignore case while string substitution

The following program shows how to replace a string by ignoring its case:

public class CaseInsensitiveStringReplace {
    public static void main(String[] args) {
        String testString = "Replace me iRResPecTive of my case!!!";
        System.out.println(testString.replaceAll("(?i)IRRESPECTIVE", ""));
    }
}

Output:
Replace me  of my case!!!

Explanation: String.replaceAll(,) has an overloaded version, which accepts the regular expression as first argument. (?i) says ignore case in regular expression terminology.

Note: Always make sure that regular expression related characters are escaped. For example, $ means at the end in regular expression terminology, which can be escaped by adding two backward slashes(\\).