public static String getSafeFilename ( String filename ) { String result = filename ; if ( result != null ) { result = result . replaceAll ( "[^a-zA-Z0-9]+" , "-" ) . replaceAll ( "^-+" , "" ) ; } return result ; }
Generate a string that is usable as a single file name or directory path segment on any operating system . Replaces unsafe characters with the underscore _ character