diff --git a/src/femagtools/me.py b/src/femagtools/me.py
index 6b940bc6..f2c823af 100644
--- a/src/femagtools/me.py
+++ b/src/femagtools/me.py
@@ -3,8 +3,8 @@
 """
 __author__ = 'dapu zhang'
 
-import re 
-import numpy as np 
+import re
+import numpy as np
 import matplotlib.pyplot as plt
 import logging
 
@@ -16,33 +16,33 @@ def get_eigenvectors(filelist, psfiles):
     eigenvecs = {}
     eigenfreq = []
     ps_data = []
-    temp = [] 
+    temp = []
     temp_arr = []
     read_fig = False
 
     if len(psfiles) > 0: read_fig = True
     if len(filelist) == 0: return []
-    
-    for k, kk in zip(filelist, range(len(filelist))): 
+
+    for k, kk in zip(filelist, range(len(filelist))):
         # read ps file
         if read_fig: ps_data.append(plt.imread(psfiles[kk]))
         eigenvecs[str(kk)] = {}
-        with open(k, 'r') as f: 
+        with open(k, 'r') as f:
             data = f.read().split('\n')
-        eigenval = float(re.split('\s+', data[0].strip())[2])
+        eigenval = float(re.split(r'\s+', data[0].strip())[2])
         eigenfreq.append(eigenval/2/np.pi)
-        
-        for i in range(len(data[1:-1])): 
-            for j in data[2+i].strip().split(' '): 
+
+        for i in range(len(data[1:-1])):
+            for j in data[2+i].strip().split(' '):
                 if j != '':
                     temp.append(float(j))
 
         temp_arr = np.array(temp).reshape(-1, 5)
         idx_collect = []
         # remove the index, at which the dof equals zero
-        for c in range(temp_arr.shape[0]): 
+        for c in range(temp_arr.shape[0]):
             if np.abs(temp_arr[c, 1]) < 1e-15 and \
-            np.abs(temp_arr[c, 2]) < 1e-15: 
+            np.abs(temp_arr[c, 2]) < 1e-15:
                 idx_collect.append(c)
         # prepare the data from the further calculation
         temp_arr = np.delete(temp_arr, np.array(idx_collect), axis=0)
@@ -52,4 +52,4 @@ def get_eigenvectors(filelist, psfiles):
         # return node position
         if kk == 0: eigenvecs.update({'node_pos': temp_arr[:, 4::]})
 
-    return [ps_data, eigenfreq, eigenvecs] 
\ No newline at end of file
+    return [ps_data, eigenfreq, eigenvecs]
diff --git a/src/femagtools/plot/fieldlines.py b/src/femagtools/plot/fieldlines.py
index 8b5fae74..8526091e 100644
--- a/src/femagtools/plot/fieldlines.py
+++ b/src/femagtools/plot/fieldlines.py
@@ -4,7 +4,7 @@
 import numpy as np
 import matplotlib.lines as mpl
 
-rgbpat = re.compile('rgb\((\d+),(\d+),(\d+)\)')
+rgbpat = re.compile(r'rgb\((\d+),(\d+),(\d+)\)')
 
 def fieldlines(svgfilename, ax=0):
     """plot fieldlines from svg file"""