The docs indicate that the s flag causes the input string to be treated as if it's a single line. The m flag, on the other hand, causes the string to be treated as if it's multi-line.
It seems that .*? can't cross the newline character when using the m flag:
# doesn't match
my ($span_m) = $str =~ /(\d\d.*?\d\d)/m;
my ($span_m) = $str =~ /(\d\d.*?\n.*?\d\d)/m;
# so does
my ($span_m) = $str =~ /(\d\d\w+\s\w+\d\d/m;
Treating the \n
as whitespace (or explicitly naming it in the regex) seems to solve the problem. Any ideas why that'd be the case?
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