How to match a newline \n in a perl regex?

Question

I want to match this line,

\'\'\'No Change Alarms Help & Information

        

Answer 1

All I needed was /gm on the end of my query, turns out it ignores new lines by default.

Answer 2

$string_given =~ s/matching expression/sustitution/s;

i think this will work,using the /s modifier, which mnemonically means to "treat string as a single line". This changes the behaviour of "." to match newline characters as well.

In order to match the beginning of this comment to the end, we add the /s modifier like this:

$str =~ s/<!-- Start.*End of section -->//s;

Without the /s, it wouldn't match at all.

Answer 3

In some cases it might not work because of how perl "slurps" the input. Passing -0777 as a parameter will make it consider multiple lines. (Pass it along with your other parameters, e.g. perl -0777pi -e)