Change regexp for greater compatibility

Change regexp in bed_temperature_matches  and extruder_temperature_matches for greater compatibility with different printers.

plugins/USBPrinting/USBPrinterOutputDevice.py

@@ -243,7 +243,7 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
                     self._last_temperature_request = time()
 
             if re.search(b"[B|T\d*]: ?\d+\.?\d*", line):  # Temperature message. 'T:' for extruder and 'B:' for bed
-                extruder_temperature_matches = re.findall(b"T(\d*): ?(\d+\.?\d*) ?\/?(\d+\.?\d*)?", line)
+                extruder_temperature_matches = re.findall(b"T(\d*): ?(\d+\.?\d*)\s*\/?(\d+\.?\d*)?", line)
                 # Update all temperature values
                 matched_extruder_nrs = []
                 for match in extruder_temperature_matches:
@@ -265,7 +265,7 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
                     if match[2]:
                         extruder.updateTargetHotendTemperature(float(match[2]))
 
-                bed_temperature_matches = re.findall(b"B: ?(\d+\.?\d*) ?\/?(\d+\.?\d*)?", line)
+                bed_temperature_matches = re.findall(b"B: ?(\d+\.?\d*)\s*\/?(\d+\.?\d*)?", line)
                 if bed_temperature_matches:
                     match = bed_temperature_matches[0]
                     if match[0]: