Perl: Extracting multiple numbers from string

Question

Could someone help me in correcting me for the following code. I want to extract the two numbers from a input string.

  input string [7:0] xxxx

I want '7' and '0' to be loaded into two variables (min and max). I am trying to achieve this by

my ($max, $min);
($max, $min) = $_ =~ /[(\d+):(\d+)]/;
print "min: $min max $max\n";

I am getting a result as

Use of uninitialized value in concatenation (.) or string at constraints.pl line 16, <PH> line 165.
min:  max: 1

regards

Answer 1

[ and ] are regex meta characters, so you have to escape them

($max, $min) = $_ =~ /\[(\d+):(\d+)\]/;

The brackets are used to denote a character class: [ ... ] which matches the characters inside it, e.g. [abc] matches a.