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Question

I read the string from file with encoding \"UTF-8\". And I need to match it to a expression. The first character of the file is #, but in the string the first i

Answer 1

Some editors (like notepad) adds BOM (byte order mask) signature when saved UTF-8 text. You should check 0xEF, 0xBB, 0xBF bytes before read string from such file and skip them if they exists.

Another way is do not use notepad for editing UTF-8 texts, get other program like Notepad++, Kate or whatever with witch you can control adding BOM.