just thought i'd share this great resource i came across, for those of us that need a helping hand with more complex regex (like me!). While there are a number of moderately helpful sites, this one really knocks it out of the park:
https://regex101.com
not only does this show matches very neatly by group (which is key for LiveCode's matchText()), it provides a live commentary explaining each individual symbol used in your expression and includes well designed searchable quick reference. And a regex debugger! It's actually much better designed than any other tool i've used before (and free

HTH,
Stam