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Markus, we need to remember that the dot in a pattern (as in regular expressions) means any single character. Maybe here we want to match a literal dot and to achieve that we have to escape it or enclose it in a character list. In any case, better to put single quotes around the pattern to prevent unwanted shell substitutions when dealing with special characters:
The real secret here is not in grep itself, but in the regular expression pattern matching, as has been pointed out above. The grep man page has a decent starter explanation of them, so read that first. After that, get on the net and google yourself a good regex tutorial. You'll be glad you did.
But after saying that, there is a grep-specific solution too. Use -F to force it to search for fixed strings.