Summary: What is the scope of $1 and when does it get reset? Details: Thanks for the reply, Ron. It indicates that I understand this even less than I thought.
What are the rules for "remembering" a previous value of $1 (and the other numeric variables set by pattern matching)? In the program where I discovered the problem I have a bunch of regexes, and so there could have been a value for $1 in effect. But I got a warning message anyway. Why wasn't that earlier value of $1 used? Or was I used, and I only got the warning where there wasn't a value for $1. Does the zero length string (aka null string) act as a previous value of $1? Thanks, Steve -----Original Message----- From: Ron Newman [mailto:[EMAIL PROTECTED] Sent: Wednesday, July 21, 2004 11:52 AM To: Tolkin, Steve Cc: [EMAIL PROTECTED] Subject: Re: [Boston.pm] I want a "compile time" check on missing parens in regex >If I intend to write something like >s/([ab])c/$1c/; >but accidentally omit the parentheses and write >s/[ab]c/$1c/; >I get a run time error message -- assuming >the pattern matches the input data. >But if the test data does not expose >this bug I might not find out about it until later. > >Is there any way to get a "compile time" check? That's not possible in general, because there could legitimately be a $1 left over from a previous regex match. _______________________________________________ Boston-pm mailing list [EMAIL PROTECTED] http://mail.pm.org/mailman/listinfo/boston-pm
