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How can I convert a text file or a String from UTF-8 format to ASCII?

For example, the following string "ZÜRICH-ZOLLI" once outputted into a text file. If the file has the format UTF-8 is has 13 characters but when the format is ASCII the number of characters is 12.

The endpoint where the file is being sent only accepts the ASCII-encoded version, and fails on the UTF-8 encoded string salesforce normally produces.

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2 Answers 2

UTF-8 is a superset of ASCII. The character codes 0-127 (i.e. the ASCII characters) are directly mapped to the binary values 0-127 so if your UTF-8 string only consists of ASCII characters it is already in ASCII format.

Beyond that all you can really do is strip out the non-ascii characters from your string or replace them with some ASCII character. This regex should do it for you.

if(!str.isAsciiPrintable) str = str.replaceall('[^\\x00-\\x7F]', '');
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data = EncodingUtil.urlEncode(data, 'ASCII');
data = EncodingUtil.urlDecode(data, 'ASCII');

(What if there is a byte order marker?)

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this worked for me! and I was able to strip the remnant byte order mark as well –  Wesley Jan 18 '13 at 12:48
That's interesting. I guess this would depend on whether you want to strip out the characters or replace with a '?'. Though of course you could easily modify replaceall to use a '?'. –  Greg Grinberg Jan 18 '13 at 19:11
the ?s are a bummer :( off-platform, iconv //TRANSLIT could at least represent Ü as U –  bigassforce Jan 18 '13 at 20:43

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