question: public static boolean isValidIANAEncoding ( String ianaEncoding ) { if ( ianaEncoding != null ) { int length = ianaEncoding . length ( ) ; if ( length > 0 ) { char c = ianaEncoding . charAt ( 0 ) ; if ( ( c >= 'A' && c <= 'Z' ) || ( c >= 'a' && c <= 'z' ) ) { for ( int i = 1 ; i < length ; i ++ ) { c = ianaEncoding . charAt ( i ) ; if ( ( c < 'A' || c > 'Z' ) && ( c < 'a' || c > 'z' ) && ( c < '0' || c > '9' ) && c != '.' && c != '_' && c != '-' ) { return false ; } } return true ; } } } return false ; }
target:  Returns true if the encoding name is a valid IANA encoding. This method does not verify that there is a decoder available for this encoding, only that the characters are valid for an IANA encoding name.