Great

Im using the REGEX for many years and this tool is the best I never used. I regret not having found the time to do it ;-)
I recommend it for all, and particularly to the 4D developers (its my job) as a great help. The live matching against source text allow to build the regex quietly. More, you can copy the pattern with compatible escaped characters with the code editor of 4D.
Bravo

vdl4 about RegExRX, v1.8.1