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 $max\n";
I am getting a result as
Use of uninitialized value in concatenation (.) or string at constraints.pl line 16, <PH> line 165.
min: max: 1
regards
[ and ] are regex meta characters, so you have to escape them
($max, $min) = $_ =~ /\[(\d+):(\d+)\]/;
The brackets are used to denote a character class: [ ... ] which matches the characters inside it, e.g. [abc] matches a.
my ($max, $min) = $_ =~ /[(\d+):(\d+)]/; I like to declare and assign in one step whenever that's possible.
my ($max, $min) = /\[(\d+):(\d+)\]/, where the $_ =~ part is implied. This often looks confusing to beginners.TLP is correct.
[] is meta character and any such character is required escaping like . () [] * etc to use it for literal match.
This would solve your problem.
($max, $min) = $_ =~ /\[(\d+):(\d+)\]/;
You may get warning if $max or $min or both would be blank i.e. [ 7: ] or [ : ] or [ : 2] or [ ] .
