The '\K' and '(?=...)' parts are explained in Lookaround Assertions under "perlre: Extended Patterns".

You can use Regexp::Debugger to see what's happening (step-by-step) as a regex is processed. I find this to be a very useful tool.

— Ken

In reply to Re^3: Help in joining these lines by kcott
in thread Help in joining these lines by Anonymous Monk

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