b05bdc00lnz64 b05hrn23ud0d3 b05bgn00lnz00 b05bgn01lnz00 #### foreach $a (@arr) { #read each line in array file for (my $count=0; $count <5; $count++) { #iteration for each ID in array file if(@arr[$count] =~ m/cell\(@arr[$count])){ #match specific line print "aa\n"; #print words at previous line } }