Ok, latest summary...

It appears that the error does not occur unless both Data::Dumper and /x are present. Since the error is so sporadic, it is hard to be sure.

NB Just avoiding the use of Data::Dumper (say by using Dumpvalue instead) is not an option, since many CPAN modules which I am using themselves use Data::Dumper.

I will hang on a bit longer, to see if anybody spots anything else, then submit a bug report.

Cheers, Kevin

In reply to Re: Re: Worrying regex issue with 5.8.0 by ruscoekm
in thread Worrying regex issue with 5.8.0 by ruscoekm

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