Re^2: Newbie: parentheses, map, etc.

The substitution operator s returns the list of captured substrings or, in scalar context, the number of captured substrings, which is 1.

This isn't true. s/// always returns the number of substitutions made or the empty string if no substitutions were made (see perlop). The expression in map is in list context.

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Re^3: Newbie: parentheses, map, etc. by ysth (Canon) on Mar 04, 2008 at 06:49 UTC
The documentation lies. On failure, it returns the canonical false value, which is an empty string in string context and 0 in numeric context. -- Online Fortune Cookie Search	[reply]
Re^4: Newbie: parentheses, map, etc. by kyle (Abbot) on Mar 04, 2008 at 15:59 UTC
Upon first reading this, I thought, "what's the difference?" More to the point, "how does one behave differently from the other?" After all, an empty string in a numeric context is zero anyway. How would one ever see the difference? Some time later, the answer popped into my head. A string turned number will trigger warnings, but `s///` won't. I verified this in the Test::More fashion. Read more... (1008 Bytes) Thanks for the food for thought.	[reply] [d/l] [select]