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

One option is to use a combination of CharMatchers:

CharMatcher charsToPreserve = CharMatcher.anyOf("\r\n\t");
CharMatcher allButPreserved = charsToPreserve.negate();
CharMatcher controlCharactersToRemove = CharMatcher.JAVA_ISO_CONTROL.and(allButPreserved);

Then use removeFrom as before. I don't know how efficient it is, but it's at least simple.

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As noted in edits, JAVA_ISO_CONTROL is now deprecated in Guava; the javaIsoControl() method is preferred.