Re^3: Greedy modifier found to be working non-greedy in a named group

> both e* and e+ should have given same output. Why is the difference in output?

Good question, I think many are confused.

It's important to understand that empty matches exist and that e* means e{0}|e+ ( or something like e{0,32766} ° ).

So you are actually matching e{0} before all!

Printing out the match position of a capture group via @+ helps demonstrating it

  DB<1> $_ = "This is a teeeext for testting";

  DB<2> ;/(?<char>e*)/   and print "'$+{char}' is matched pattern at p
+os $+[0]\n";
'' is matched pattern at pos 0

  DB<3> ;/(?<char>e{0})/   and print "'$+{char}' is matched pattern at
+ pos $+[0]\n";
'' is matched pattern at pos 0

  DB<4> ;/(?<char>e+)/   and print "'$+{char}' is matched pattern at p
+os $+[0]\n";
'eeee' is matched pattern at pos 15

  DB<5> ;/(?<char>e{1,32766})/   and print "'$+{char}' is matched patt
+ern at pos $+[0]\n";
'eeee' is matched pattern at pos 15

  DB<6>
[download]

update

Actually $+[0] gives you the end of the first match, $-[0] will give you the start.
e* is not limited in my Perl version but the upper bound in e{,} is.
couldn't find positions of named groups

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

Wikisyntax for the Monastery
FootballPerl is like chess, only without the dice}

°) yes there is an maximal upper bound in range quantifiers, which I expected to be around 2**16, so it's an incomplete analogy

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Re^4: Greedy modifier found to be working non-greedy in a named group by rsFalse (Chaplain) on Nov 30, 2019 at 15:05 UTC
> ...and that e* means e{0}\|e+ ( or something like e{0,32766} ° ). > So you are actually matching e{0} before all! And if the sentence begins with "e.."? :)	[reply]
Re^5: Greedy modifier found to be working non-greedy in a named group by LanX (Saint) on Nov 30, 2019 at 20:19 UTC
Good catch! The order must be reversed to reflect the greed. `DB<8> x 'eeeA1234eB' =~ /(e+\|e{0})(.)/ 0 'eee' 1 'A' DB<9> x 'A1234eB' =~ /(e+\|e{0})(.)/ 0 '' 1 'A' DB<10> x 'A1234eB' =~ /(e+)(.)/ 0 'e' 1 'B' DB<11>` [download] Thanks! Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice} Updates Improved demo code	[reply] [d/l]
Re^4: Greedy modifier found to be working non-greedy in a named group by rkabhi (Acolyte) on Nov 29, 2019 at 12:59 UTC
That was very good explanation. Thanks a lot !! Regards, Abhishek	[reply]

update

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