According to perldoc http://perldoc.perl.org/functions/map.html

map should evaluate BLOCK in list context 

 Evaluates BLOCK or EXPR in list context

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but I am wondering why in my example, sometimes it's LIST context, sometimes SCALAR. 
print "A:";
print map { /(\S+)/g or die } qq{ab cd}; # prints "A:1" so evaluated i
+n scalar context
print "\n";

print "B:";
print map { /(\S+)/g  } qq{ab cd}; # prints "B:abcd", means evaluated 
+in list context
print "\n";

print "C:";
for (qq{ab cd}) {
    print /(\S+)/g or die; # prints "C:abcd", list context again
}
print "\n";

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In reply to map BLOCK evaluation context by vsespb

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