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AnswerRe: Regex Problem Pin
Luc Pattyn27-Feb-09 1:26
sitebuilderLuc Pattyn27-Feb-09 1:26 
Hi musefan,

whne you read text from a file, an encoding is used; you can specify one explicitly, most methods (e.g. File.ReadAllText) allow you to specify one; or you get your system's default encoding implicitly, which depends on regional settings.

I expect the regional setting ("code page") to be such that a lot of special characters get encoded in the byte value range [0x80, 0xFF], in order to save bytes in a file (and make it region-dependent!).
As an example, in Western Europe the default code page is 1252, which puts the Euro sign at 0x80, although there also is a Unicode character for it (0x20AC). So by default, reading a file containing 0x80 will result in a string with a 0x20AC at that position.

No, Regex does not work on files or streams, it needs a string.

No, progress indication is not really possible when you ask for a bulk operation such as File.ReadAllLines, a Regex operation, an SQL database operation, etc. Progress indication is available only when you implement it, which implies there are many steps in the job, possibly forcing you to cut the job in small steps (and forego the big methods such as ReadAllLines, and all Regex stuff).

I'm not a very big fan of Regex for your needs, I would have coded that with direct byte or char manipulations on the stream. Not sure whether I would chose bytes or chars though, probably bytes since your file does not really qualify as text, due to the 0xFF stuff.

Smile | :)
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modified on Sunday, June 12, 2011 8:43 AM

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