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perl regex multi line cut

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# 8  
Old 07-08-2010
Quote:
Originally Posted by durden_tyler
Maybe something like this ?

Code:
$
$ cat f5
some code here
and some more code here
=comment
blabla
blah blah blah
more blah blah
=cut
some code here
some more code here
=comment
blah more blah
=cut
and more code...
$
$ perl -lne 'BEGIN{undef $/} s/^=.*?=cut//msg; print' f5
some code here
and some more code here
 
some code here
some more code here
 
and more code...

tyler_durden
yes! that works. thank you
but i would like to know HOW it works Smilie

why are you use /sm ? is it not 2 different options?? for multi-line and single line?
why need undef$/ if you have /sm ?
how to make the same work in a script inside?
tip78
# 9  
Old 07-08-2010
Quote:
why need undef$/ if you have /sm ?
It sets record separator to undef, so whole file will be loaded into $_ variable.

Quote:
why are you use /sm ? is it not 2 different options?? for multi-line and single line?
/s effect is that "." matches any character in string, including newline.
/m causes ^ and $ to match not only begin and end of the whole string, but also newline characters inside of it.
# 10  
Old 07-08-2010
And another one (f5 is the same as above)
Code:
$ perl -nle 'print unless /=.*?/ .. /=cut/' f5
some code here
and some more code here
some code here
some more code here
and more code...
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