Re^4: Regex: matching character which happens exactly once (updated)

What is the right thing???

I can only judge the implementation, which considers $1 ff to be global.

This demonstrates whats happening, $2 is always the next character or empty.

  DB<322> ;m/ ^ .*? (?{say "<$_ $2>"})  (.) (?=(.|$)) (*FAIL)/x
<babab >
<babab a>
<babab b>
<babab a>
<babab b>
<babab >
[download]

Cheers Rolf
_{(addicted to the Perl Programming Language and ☆☆☆☆ :)

Je suis Charlie!}

Comment on Re^4: Regex: matching character which happens exactly once (updated) Download Code

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Re^5: Regex: matching character which happens exactly once (updated) by QM (Parson) on Oct 23, 2017 at 16:57 UTC
You're asking theoretical questions, and then getting bogged down in current implementation. Turn this around. What would you want to happen if you had a forward reference? -QM -- Quantum Mechanics: The dreams stuff is made of	[reply]
Re^6: Regex: matching character which happens exactly once (updated) by LanX (Saint) on Oct 23, 2017 at 18:51 UTC
You seem to think it's a bug, for me it's most likely a feature. I think this stems from the foundations of regular expressions as state machines. > What would you want to happen if you had a forward reference? Something wonderful, HAL! Cheers Rolf _{(addicted to the Perl Programming Language and ☆☆☆☆ :) Je suis Charlie!}	[reply]