diff --git a/pydevices/MitDevices/dt100.py b/pydevices/MitDevices/dt100.py
index c43aa2899b..c8e7ac1319 100755
--- a/pydevices/MitDevices/dt100.py
+++ b/pydevices/MitDevices/dt100.py
@@ -158,7 +158,7 @@ def acq2sh(self, command):
 
     def waitState(self, state):
         import pexpect
-        regstr = '([0-9\.]*) [0-9] ST_(.*)\r\n'
+        regstr = '([0-9\\.]*) [0-9] ST_(.*)\r\n'
         dprint("waitState %s" % regstr)
         wantex = re.compile(regstr)
 
diff --git a/pydevices/RfxDevices/CYGNET4K.py b/pydevices/RfxDevices/CYGNET4K.py
index d1803ce73e..536d5d01d3 100644
--- a/pydevices/RfxDevices/CYGNET4K.py
+++ b/pydevices/RfxDevices/CYGNET4K.py
@@ -358,7 +358,7 @@ def setValue(self, addrlist, value, useExtReg=False):
         def resetMicro(self):
             """Will trap Micro causing watchdog and reset of firmware."""
             # The camera will give no response to this command
-            self.serialIO(b'\x55\x99\x66\x11\x50\EB', None)
+            self.serialIO(b'\x55\x99\x66\x11\x50\xEB', None)
             return self
 
         def setSystemState(self, byte):
@@ -458,7 +458,7 @@ def setRoiXSize(self, value):
 
         def setRoiXOffset(self, value):
             """set ROI X offset as 12-bit value"""
-            return self.setValue(b'\81\x82', min(0xFFF, value), True)
+            return self.setValue(b'\x81\x82', min(0xFFF, value), True)
 
         def setRoiYSize(self, value):
             """set ROI Y size as 12-bit value"""
diff --git a/pydevices/RfxDevices/FAKECAMERA.py b/pydevices/RfxDevices/FAKECAMERA.py
index b802e769ea..5c188a5af6 100644
--- a/pydevices/RfxDevices/FAKECAMERA.py
+++ b/pydevices/RfxDevices/FAKECAMERA.py
@@ -37,7 +37,7 @@ class FAKECAMERA(Device):
         {'path': ':COMMENT', 'type': 'text'},
         {'path': ':EXP_NAME', 'type': 'text', 'value': 'cameratest'},
         {'path': ':EXP_SHOT', 'type': 'text', 'value': '84'},
-        {'path': ':EXP_NODE', 'type': 'text', 'value': '\CAMERATEST::FLIR:FRAMES'},
+        {'path': ':EXP_NODE', 'type': 'text', 'value': '\\CAMERATEST::FLIR:FRAMES'},
         {'path': ':FRAME_RATE', 'type': 'numeric', 'value': 25},
         {'path': ':READ_LOOP', 'type': 'text', 'value': 'NO'},
         {'path': ':STREAMING', 'type': 'text', 'value': 'Stream and Store'},
diff --git a/pydevices/RfxDevices/PLFE.py b/pydevices/RfxDevices/PLFE.py
index 3da78adffa..f8e502bcaf 100644
--- a/pydevices/RfxDevices/PLFE.py
+++ b/pydevices/RfxDevices/PLFE.py
@@ -217,9 +217,9 @@ def copyBits(self, source, dest, mask):
 
     def deserialize_msg(self, msg):
         assert re.match(
-            '^(\#[0-5][01]([01][0-9][0-9]|2[0-4][0-9]|25[0-5])){6}$', msg)
+            '^(\\#[0-5][01]([01][0-9][0-9]|2[0-4][0-9]|25[0-5])){6}$', msg)
 
-        # assert re.match('^(\#[0-5][01]([01][0-9][0-9]|2[0-5][0-5])){6}$', msg)
+        # assert re.match('^(\\#[0-5][01]([01][0-9][0-9]|2[0-5][0-5])){6}$', msg)
 
         data = []