Java Regex

1. Case-insensitive matching: https://blogs.oracle.com/xuemingshen/entry/case_insensitive_matching_in_java
   • (?i) means: for ASCII case-insensitive matching:
     • "XYZxyz".matches("(?i)[a-z]+")
   • (?iu) means: for Unicode case-folding
2. s
3. s
4. s
5. s
6. ss