Oops, missed the second question.

and also the [0] on the end of the return?

In list context, the match operator returns what it captured. I used a list slice to force list context. 

$x = 'abc' =~ /a(.)c/;         # 1 (or false on fail)
@x = 'abc' =~ /a(.)c/;         # b (or () on fail)
$x = ( 'abc' =~ /a(.)c/ )[0];  # b (or undef on fail)

[download]
I could also have used 
$x = 'abc' =~ /a(.)c/ && $1;   # b (or false on fail)

[download]

In reply to Re^3: Extract Multiple Lines from the End of a multi-line string by ikegami
in thread Extract Multiple Lines from the End of a multi-line string by NateTut

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