Try like this. 
#!/usr/bin/perl
my $line  = "System has tool zigzag version 3.6";
my $match = 'System\s+has\s+tool\s+(\w)\s+version\s+(.*)';
my $replace = '"System has tool $1 version ABC"';
$line =~ s/$match/$replace/eg;
print "Line after replacement: $line \n"

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In reply to Re: delayed variable interpolation in a regular expression by ashokpj
in thread delayed variable interpolation in a regular expression by wannabeperlie

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