question: public static String cleanString ( String src ) { if ( src == null ) { return null ; } boolean foundBad = false ; final CharacterIterator it = new StringCharacterIterator ( src ) ; for ( char c = it . first ( ) ; c != CharacterIterator . DONE ; c = it . next ( ) ) { if ( c < ASCII_PRINTABLE_LOW || c >= ASCII_PRINTABLE_HI ) { foundBad = true ; break ; } } if ( ! foundBad ) { return src ; } final StringBuilder res = new StringBuilder ( ) ; for ( char c = it . first ( ) ; c != CharacterIterator . DONE ; c = it . next ( ) ) { if ( c < ASCII_PRINTABLE_LOW || c >= ASCII_PRINTABLE_HI ) { res . append ( ASCII_SPACE ) ; } else { res . append ( c ) ; } } return res . toString ( ) ; }
target:  Returns a string based on the input string, but with all characters with ordinal values < 32 or >= 128 replaced with ' '.