How to remove control characters from java string?

Question

I have a string coming from UI that may contains control characters, and I want to remove all control characters except carriage returns, line feeds

Answer 1

In Java regular expression, it is possible to exclude some characters in a character class. Here's a sample program demonstrate something similar:

class test {
    public static void main (String argv[]) {
            String testStr="abcdefABCDEF";
            System.out.println(testStr);
            System.out.println(testStr.replaceAll("[\\p{Lower}&&[^cd]]",""));
    }
}

It will produce this output:

abcdefABCDEF
cdABCDEF