Use raw strings for regex in unicode.py

Author: Clar Charr

src/libcore/unicode/unicode.py

@@ -240,8 +240,8 @@ def format_table_content(f, content, indent):
 def load_properties(f, interestingprops):
     fetch(f)
     props = {}
-    re1 = re.compile("^ *([0-9A-F]+) *; *(\w+)")
-    re2 = re.compile("^ *([0-9A-F]+)\.\.([0-9A-F]+) *; *(\w+)")
+    re1 = re.compile(r"^ *([0-9A-F]+) *; *(\w+)")
+    re2 = re.compile(r"^ *([0-9A-F]+)\.\.([0-9A-F]+) *; *(\w+)")
 
     for line in fileinput.input(os.path.basename(f)):
         prop = None
@@ -466,7 +466,7 @@ def emit_norm_module(f, canon, compat, combine, norm_props):
         # download and parse all the data
         fetch("ReadMe.txt")
         with open("ReadMe.txt") as readme:
-            pattern = "for Version (\d+)\.(\d+)\.(\d+) of the Unicode"
+            pattern = r"for Version (\d+)\.(\d+)\.(\d+) of the Unicode"
             unicode_version = re.search(pattern, readme.read()).groups()
         rf.write("""
 /// The version of [Unicode](http://www.unicode.org/) that the Unicode parts of