That means that you already lost the actual character's value that was there before. Published Jan 26, 2020. Non-printable ASCII characters list A table containing all the non-printable ASCII characters. Consider below given string containing the non ascii characters. ASCII is a set of 128 characters, 33 control characters (I'm including DEL) and 95 printable characters. This range is part of the ISO-Latin character set and includes the entire "top half" of the ISO-Latin set 80-FF hex (128-255 decimal). IBM Informix database servers support non-ASCII (wide, 8-bit, and multibyte) characters from the code set of the database locale in most SQL identifiers, such as the names of columns, connections, constraints, databases, indexes, roles, SPL routines, sequences, synonyms, tables, triggers, and views. A complete encoding table is given below. The last 3 characters are EFBFBD, which is UTF-8 for "FFFD" - the diamond question mark you see (wlatin1 doesn't parse that properly). Codes 0 through 127 are ASCII characters; the codes from 128 through 255 are used for one non-ASCII character set (you can choose which character set by setting the variable nonascii-insert-offset). The allow high-bit characters Request Filter enables rejection of requests containing non-ASCII characters. Choose a file to check for non-ASCII characters: OR Copy/paste your code here to check for non-ASCII characters: This does not seem to be what you want. They are a character encoding standard using 7-digit binary numbers to display symbols. Non-ASCII control characters − These are characters beyond the ASCII character set of 128 characters. The problem: People living in countries, with languages including non-ANSI characters and want a full English Windows environment. Description; By setting limits on web requests, it ensures availability of web services and mitigates the risk of buffer overflow type attacks. If the user sets the System locale (Language for non-Unicode programs) to the country they live in, then many apps will check this setting and without giving the user any option, are installed with a localized interface, i.e. The other answers define pretty well what is ASCII and what is non-ASCÌI. A table containing all the non-printable ASCII characters. This example shows how to remove non ascii characters from String in Java using various regular expression patterns and string replaceAll method. ASCII control characters non printable : ASCII code 00 = NULL ( Null character ) ASCII code 01 = SOH ( Start of Header ) ASCII code 02 = STX ( Start of Text ) ASCII code 03 = ETX ( End of Text, hearts card suit ) ASCII code 04 = EOT ( End of Transmission, diamonds card suit ) ASCII code 05 = ENQ ( Enquiry, clubs card suit ) ASCII code 06 = ACK ( Acknowledgement, spade card suit ) In multibyte representation, a character may occupy more than one byte, and as a result, the full range of Emacs character codes can be stored. I would like to add some background and consequences. What you want, if I understood correctly, is to identify characters that are not used in languages that use the roman alphabet. Character ranges 00-1F hex (0-31 decimal) and 7F (127 decimal). DEC: HEX: CHARACTER: 0: 0: NULL: 1: 1: START OF HEADING (SOH) 2: 2: START OF TEXT (STX) 3: 3: END OF TEXT (ETX) 4: 4: END OF TRANSMISSION (EOT) 5: 5: Many times you want to remove non ascii characters from the string. 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