Merge branch 'maint'

* MAINT: use raw strings in re patterns

Author: pavoljuhas

src/diffpy/Structure/SymmetryUtilities.py

@@ -83,7 +83,7 @@ def check_cubic():
 # compiled per every single call.
 
 _rx_constant_formula = re.compile(
-    '[-+]?(\d+(\.\d*)?|\.\d+)([eE][-+]?\d+)??(/[-+]?\d+)?$')
+    r'[-+]?(\d+(\.\d*)?|\.\d+)([eE][-+]?\d+)??(/[-+]?\d+)?$')
 
 def isconstantFormula(s):
     """Check if formula string is constant.  True when argument

src/diffpy/Structure/applications/anyeye.py

@@ -144,7 +144,7 @@ def cleanUp(pd):
 def parseFormula(formula):
     """parse chemical formula and return a list of elements"""
     # remove all blanks
-    formula = re.sub('\s', '', formula)
+    formula = re.sub(r'\s', '', formula)
     if not re.match('^[A-Z]', formula):
         raise RuntimeError("InvalidFormula '%s'" % formula)
     elcnt = re.split('([A-Z][a-z]?)', formula)[1:]