Here are different Regular Expressions to identify the common (to me at least), the Subversion keyword: $Id$ on different type of files (depending on how the comments go).
This one is for languages derived from C (like C++, C#, PHP, Java, JavaScript):
// \$Id\: [A-Za-z0-9\ \:\.\-\_]* \$
It will match something like:
// $Id: filename [...]
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