question: private String processFloatToken ( String token ) { String result = token . replaceAll ( groupSeparator , "" ) ; if ( ! decimalSeparator . equals ( "\\." ) ) result = result . replaceAll ( decimalSeparator , "." ) ; boolean isNegative = false ; int preLen = negativePrefix . length ( ) ; if ( ( preLen > 0 ) && result . startsWith ( negativePrefix ) ) { isNegative = true ; result = result . substring ( preLen ) ; } int sufLen = negativeSuffix . length ( ) ; if ( ( sufLen > 0 ) && result . endsWith ( negativeSuffix ) ) { isNegative = true ; result = result . substring ( result . length ( ) - sufLen , result . length ( ) ) ; } if ( result . equals ( nanString ) ) result = "NaN" ; if ( result . equals ( infinityString ) ) result = "Infinity" ; if ( isNegative ) result = "-" + result ; Matcher m = NON_ASCII_DIGIT . matcher ( result ) ; if ( m . find ( ) ) { StringBuilder inASCII = new StringBuilder ( ) ; for ( int i = 0 ; i < result . length ( ) ; i ++ ) { char nextChar = result . charAt ( i ) ; if ( Character . isDigit ( nextChar ) ) { int d = Character . digit ( nextChar , 10 ) ; if ( d != - 1 ) inASCII . append ( d ) ; else inASCII . append ( nextChar ) ; } else { inASCII . append ( nextChar ) ; } } result = inASCII . toString ( ) ; } return result ; }
target:  The float token must be stripped of prefixes, group separators, and suffixes, non ascii digits must be converted into ascii digits before parseFloat will accept it. If there are non-ascii digits in the token these digits must be processed before the token is passed to parseFloat.