It means that the rules for parsing (?{}) and (??{}) are different than parsing normal perl code. The main difference is that all brackets must be either backslashed or balanced. For instance, this re is invalid: 

/(??{ "\d+" if $1 eq "{" })/

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It would need to be changed to: 

/(??{ "\d+" if $1 eq "\{" })/

[download]

In reply to Re: Perlre interpretation required by jryan
in thread Perlre interpretation required by BrowserUk

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