1 files changed, 12 insertions, 2 deletions
diff --git a/coverage/files.py b/coverage/files.py
index 08ce1e8..1ed7276 100644
--- a/coverage/files.py
+++ b/coverage/files.py
@@ -147,7 +147,7 @@ def prep_patterns(patterns):
 class TreeMatcher(object):
     """A matcher for files in a tree."""
     def __init__(self, directories):
-        self.dirs = directories[:]
+        self.dirs = list(directories)
 
     def __repr__(self):
         return "<TreeMatcher %r>" % self.dirs
@@ -177,7 +177,17 @@ class FnmatchMatcher(object):
     """A matcher for files by filename pattern."""
     def __init__(self, pats):
         self.pats = pats[:]
-        self.re = re.compile(join_regex([fnmatch.translate(p) for p in pats]))
+        # fnmatch is platform-specific. On Windows, it does the Windows thing
+        # of treating / and \ as equivalent. But on other platforms, we need to
+        # take care of that ourselves.
+        fnpats = (fnmatch.translate(p) for p in pats)
+        fnpats = (p.replace(r"\/", r"[\\/]") for p in fnpats)
+        if sys.platform == 'win32':
+            # Windows is also case-insensitive.  BTW: the regex docs say that
+            # flags like (?i) have to be at the beginning, but fnmatch puts
+            # them at the end, and have two there seems to work fine.
+            fnpats = (p + "(?i)" for p in fnpats)
+        self.re = re.compile(join_regex(fnpats))
 
     def __repr__(self):
         return "<FnmatchMatcher %r>" % self.pats