Make logging of erratic regular expressions more verbose to help
identification and resolving of the configuration issue:
eg.:
old: 24 Dec 18:40:09 - [error] [change:Strip kW] Invalid regex: *kW
new: 24 Dec 18:40:09 - [error] [change:Strip kW] Invalid regular
expression: /*kW/: Nothing to repeat
old: 24 Dec 20:15:57 - [error] [change:Strip kW] Invalid regex: *kW
new: 24 Dec 20:15:57 - [error] [change:Strip kW] Invalid regular
expression: /[kW/: Unterminated character class
Adding exception handling to the change node to prevent node-RED from
crashing on invalid regular expressions eg. “*kW” (missing escape
before the asterix)