special character « replace « Java Regex Q&A

1. replace special characters in string in java    stackoverflow.com

I want to know how to replace the string in Java. E.g.

String a = "adf?sdf";

2. Regex for replacing special characters    coderanch.com

String name= "12E463~1.jpg"; String newName = name.replaceAll("[a-zA-Z1-90_\\- \\.]*","_"); String name has some value which contains some special characters. I want all characters apart from A-Z a-z 0-9 . (dot) _ (underscore) - (hyphen) to be replaced with an _ (underscore) So I should get 12E463_1.jpg in newName But using the above regex the opposite happens. All characters apart from the special ...

3. Regular Expression to Replace Special Characters except Decimal    forums.oracle.com