Re: Re: search, replace and backrefrences

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Re: Re: Re: search, replace and backrefrences by diotalevi (Canon) on Sep 30, 2002 at 16:56 UTC
Even with the number formatting semantics where `1_000_000 == 1000000`?	[reply] [d/l]
Identifiers - numbers & underscores by rir (Vicar) on Sep 30, 2002 at 17:03 UTC
Even with the number formatting semantics where 1_000_000 == 1000000? Yes this use of underscores is only for numeric literals.	[reply]
Re: Re: Re: search, replace and backrefrences by demerphq (Chancellor) on Sep 30, 2002 at 19:27 UTC
Variable names that start with a digit may only have more digits in the name. Cool. I didnt know that. What perldoc is it in? This seems a murky area. my $99; throws an error. Well, i agree its weird, but its not that murky. All of the ^\d+$ variables are global only and cannot be my()ed (and all of the scalars are read only). --- demerphq my friends call me, usually because I'm late....	[reply]
numerically named vars by rir (Vicar) on Sep 30, 2002 at 20:23 UTC
I was about to say murky, but unimportant but bit my tongue as everything is important to someone. It seems unclear what behavior is intended, i.e. murky. Why shouldn't I be able to `my $99;`? I haven't seen anything to suggest it is illegal. Or why is `$123456` read-only? Is this documented somewhere? Point me at it. I'm pretty sure I got that from the Camel book.	[reply] [d/l] [select]
Re: numerically named vars by demerphq (Chancellor) on Sep 30, 2002 at 20:32 UTC
Its partly documented in perlvar but mostly in the camel. Basically all the digit scalars are used for doing pattern match storage. Apparently one of the other scripting langugae had a limit (i think 9) on the number of capture buffers allowed. I believe it was a matter of pride that perl could handle an unbounded number (ykwim). And as all of the capture buffers are read-only that makes them all read only. The lexical bit I dont remember. :-) --- demerphq my friends call me, usually because I'm late....	[reply]
Re: numerically named vars by Shendal (Hermit) on Sep 30, 2002 at 20:28 UTC
From perldoc perlvar: $<digits> Contains the subpattern from the corresponding set of parentheses in the last pattern matched, not counting patterns matched in nested blocks that have been exited already. (Mnemonic: like \digits.) These variables are all read-only. Cheers, Shendal	[reply]