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my $input1 = 'a=1 gibberish b=2 c=3';
my $input2 = 'a=1 gibberish c=3';

my $input1 = 'a=1 gibberish b=2 c=3';
my $input2 = 'a=1 gibberish c=3';
...

if ($input2 =~ m/$match2/){ print "Input2: a is $+{a} and b is $+{b} a
+nd c is $+{c}\n"; }
else { print "Input2: didn't match\n"; }

Using match1 ---> ^(?<a>a=(\d)).*?(?<b>b=(\d)).*?(?<c>c=(\d))$

...

Input1: a is a=1 and b is  and c is c=3
Input2: a is a=1 and b is  and c is c=3