Re: Some odd ambiguity in this regex (updated)

Further to hippo's post:

... something in the steps you are not showing us.

misterperl: It's easy to contrive that scenario entirely separate from debug mode:

c:\@Work\Perl\monks>perl -wMstrict -le
"$_ = '1223w3433.45+34';
 ;;
 /\d\D*/g;
 printf qq{'$&' } while /\d\D*/g;
"
'2' '2' '3w' '3' '4' '3' '3.' '4' '5+' '3' '4'
[download]

m//g in scalar or void context "remembers" the point at which a previous match ended and continues matching from that point. See pos.

Update: See what happens if the side-effect-producing, void context
/\d\D*/g;
statement is changed to
() = /\d\D*/g;
(i.e., if list context is imposed).

Give a man a fish: <%-{-{-{-<

Comment on Re: Some odd ambiguity in this regex (updated) Select or Download Code

Replies are listed 'Best First'.
Re^2: Some odd ambiguity in this regex (updated) by ikegami (Patriarch) on Jun 06, 2020 at 21:11 UTC
It's often the result of using the nonsensical `if (/.../g)` `$ perl -e' $_ = "abc"; if (/\w/g) { CORE::say for /(\w)/g; } ' b c` [download]	[reply] [d/l] [select]
Re^2: Some odd ambiguity in this regex (updated) by misterperl (Friar) on Jun 05, 2020 at 16:59 UTC
I dont think I "contrived" anything. I did "R" and the first line was : `$_= '1223w3433.45+34';` [download] then I did the "x". If the debugger works as you suggest, then it's not working right. It should interpret the expression correctly; if something isn't reset (which doesnt make sense ,since this happens on line 2) than it needs to get reset.. Larry? But, you're correct it IS a debugger thing because the interpretation is correct outside dbg...	[reply] [d/l]
Re^3: Some odd ambiguity in this regex (updated) by LanX (Saint) on Jun 05, 2020 at 17:17 UTC
Please apply this single line and show us the result: `DB<5> x $_='12a3b'; /\d\D/g 0 1 1 '2a' 2 '3b' DB<6>` [download] > But, you're correct it IS a debugger thing* Very unlikely. And you've already been quick to blame Perl in the past. Edit We need a possibility to reproduce your problem before searching a hypothetical bug. So please reproduce, and tell us the versions of perl and the debugger. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l]

Edit