diff --git a/plugins/libvirt/kvm_net b/plugins/libvirt/kvm_net
index e464b6ed..e03794ba 100755
--- a/plugins/libvirt/kvm_net
+++ b/plugins/libvirt/kvm_net
@@ -32,8 +32,10 @@ GPLv3
 =cut
 """
 
-import re, os, sys
+import os
+import re
 from subprocess import Popen, PIPE
+import sys
 
 
 def config(vm_names):
@@ -78,7 +80,6 @@ def fetch(vms):
 
     @param dictionnary {kvm_pid: cleaned vm name}
     """
-    res = {}
     for pid in vms:
         tap = get_vm_mac(pid)
         try:
@@ -105,10 +106,11 @@ def find_vm_names(pids):
 
     @return a dictionnary of {pids : cleaned vm name}
     """
+    vm_name_regex = re.compile(r"^.*-name\x00([a-zA-Z0-9.-_-]*)\x00\-.*$")
     result = {}
     for pid in pids:
         cmdline = open("/proc/%s/cmdline" % pid, "r")
-        result[pid] = clean_vm_name(re.sub(r"^.*-name\x00([a-zA-Z0-9.-_-]*)\x00\-.*$",r"\1", cmdline.readline()))
+        result[pid] = clean_vm_name(vm_name_regex.sub(r"\1", cmdline.readline()))
     return result
 
 
@@ -119,7 +121,7 @@ def get_vm_mac(pid):
     """
     cmdline = open("/proc/%s/cmdline" % pid, "r")
     line = cmdline.readline()
-    mac = re.sub(r"^.*ifname=(tap[^,]+),.*$",r"\1", line)
+    mac = re.sub(r"^.*ifname=(tap[^,]+),.*$", r"\1", line)
     return mac