[console] Fix invalid regex warning

Author: nyalldawson

python/console/console_sci.py

@@ -619,7 +619,7 @@ def runCommand(self, cmd):
         self.writeCMD(cmd)
         import webbrowser
         self.updateHistory(cmd)
-        version = 'master' if 'master' in Qgis.QGIS_VERSION.lower() else re.findall('^\d.[0-9]*', Qgis.QGIS_VERSION)[0]
+        version = 'master' if 'master' in Qgis.QGIS_VERSION.lower() else re.findall(r'^\d.[0-9]*', Qgis.QGIS_VERSION)[0]
         if cmd in ('_pyqgis', '_api', '_cookbook'):
             if cmd == '_pyqgis':
                 webbrowser.open("https://qgis.org/pyqgis/{}".format(version))