Fix invalid escape syntax warnings

Additionally use rawstrings with all regex calls

scripts/dump_data.py

@@ -117,7 +117,7 @@ class PyfaJsonWriter(BaseWriter):
         # Prefer safe way - replace any characters besides
         # alphanumeric and few special characters with
         # underscore
-        writer_safe_name = re.sub('[^\w\-.,() ]', '_', name, flags=re.UNICODE)
+        writer_safe_name = re.sub(r'[^\w\-.,() ]', '_', name, flags=re.UNICODE)
         return writer_safe_name
 
 

scripts/effectUsedBy.py

@@ -395,7 +395,7 @@ effectids_eos = set()
 
 with open(effects_path) as f:
     for line in f:
-        m = re.match("class Effect(\d+)\(", line)
+        m = re.match(r"class Effect(\d+)\(", line)
         if m:
             effectid = int(m.group(1))
             effectids_eos.add(effectid)

scripts/itemDiff.py

@@ -57,7 +57,7 @@ def main(old, new, groups=True, effects=True, attributes=True, renames=True):
 
     with open(effectspath) as f:
         for line in f:
-            for m in re.finditer('class Effect(?P<eid>\d+)\(BaseEffect\):', line):
+            for m in re.finditer(r'class Effect(?P<eid>\d+)\(BaseEffect\):', line):
                 effectid = int(m.group('eid'))
                 implemented.add(effectid)