I suspect it's \G and all the matching groups. Do you have some sample data and a description of what you're trying to do? There may be a way to do it without all the backrefs.

In reply to Re: regex gotcha moving from 5.8.8 to 5.30.0? by kschwab
in thread regex gotcha moving from 5.8.8 to 5.30.0? by mordibity

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