Thank you for your reply. As you can see from my reply to ikegami we have been thinking in parallel. I have tried to get my head around the output from re debug before but found the learning curve very steep. Today in the documentation I spotted use re 'debugcolor'; which gave me enough of a helping hand (even in black and white) to start to penetrate the mystery. I have been meaning to get the Owl Book mentioned by sgt for some time but today has shown that I have a long way to go in my understanding; buying the book is now a priority.

Cheers,

JohnGG

In reply to Re^2: Regex code block executes twice per match using look-arounds by johngg
in thread Regex code block executes twice per match using look-arounds by johngg

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