BrowserUk,
Ok, next thing you might want to look at (still guessing here) is the re pragma. Specifically the trie settings in 'Debug' mode (note 'Debug' ne 'debug'). I have sent a message to demerphq outside of PM channels in case he doesn't log in relatively soon as well.

Cheers - L~R

In reply to Re^3: 5.10.0 regex slowdown by Limbic~Region
in thread 5.10.0 regex slowdown by BrowserUk

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