Re^2: Regex: Embedded pattern-match modifiers: Empty (?) modifier

My guess — and it’s no more than a guess — is that the documentation is wrong, and should read: Zero or more embedded pattern-match modifiers ...

Even if it is only a guess that the documentation is wrong: if it is underpinned by valid test cases, this warrants a bug report, so this can be evaluated and eventually be fixed.

perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'

Comment on Re^2: Regex: Embedded pattern-match modifiers: Empty (?) modifier

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Re^3: Regex: Embedded pattern-match modifiers: Empty (?) modifier by choroba (Cardinal) on Feb 12, 2018 at 14:09 UTC
Reported. Watch the thread for updates, currently it isn't clear whether the code will be fixed, or the docs. ($q=q:Sq=~/;[c](.)(.)/;chr(-\|\|-\|5+lengthSq)`"S\|oS2"`map{chr \|+ord }map{substrSq`S_+\|`\|}3E\|-\|`7**2-3:)=~y+S\|`+$1,++print+eval$q,q,a, [download]	[reply] [d/l]
Re^4: Regex: Embedded pattern-match modifiers: Empty (?) modifier by khw (Acolyte) on Mar 23, 2019 at 18:37 UTC
Perl 5.30 will change the documentation to Zero, and this will remain legal to accommodate machine generated code. A warning will be issued if the pattern is compiled within the scope of a "use re 'strict'" pragma. This will accommodate people who want to catch no-ops that are possibly typos.	[reply]