Hi, there! I want to extract all the occurrence of the string starting with the message whose name is "MSG_ID_CELL_INFO_PRINT", and the string starting with the end message name "MSG_ID_CELL_CAMP_REQ". And I also want to compare the "cellid" value of the "MSG_ID_CELL_INFO_PRINT" which is closest to the "MSG_ID_CELL_CAMP_REQ", i.e., the line whose sn=11 vs the line whose sn=15 and sn=24 vs sn=25. If the "cellid" is different, then save all the "MSG_ID_CELL_INFO_PRINT" (or maybe five instances, not all) before the "MSG_ID_CELL_CAMP_REQ" including the "MSG_ID_CELL_CAMP_REQ" into another file. Here is the example data: 

MSG_ID_CELL_INFO_PRINT sn=1 cellid=2; 
MSG_ID_CAMP_RSP sn=2 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=3 cellid=5;
MSG_ID_CELL_INFO_PRINT sn=5 cellid=2;
MSG_ID_CAMP_RSP sn=6 cellid=4; 
MSG_ID_CAMP_RSP sn=8 cellid=2;  
MSG_ID_CELL_INFO_PRINT sn=10 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=11 cellid=5; 
MSG_ID_CAMP_RSP sn=12 cellid=2; 
MSG_ID_CAMP_RSP sn=14 cellid=3; 
MSG_ID_CELL_CAMP_REQ sn=15 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=16 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=17 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=18 cellid=2; 
MSG_ID_CAMP_RSP sn=19 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=20 cellid=5; 
MSG_ID_CELL_INFO_PRINT sn=21 cellid=2;
MSG_ID_CAMP_RSP sn=22 cellid=4; 
MSG_ID_CAMP_RSP sn=23 cellid=2;  
MSG_ID_CELL_INFO_PRINT sn=24 cellid=2;  
MSG_ID_CELL_CAMP_REQ sn=25 cellid=2;

[download]

The expected results are: since the "cellid" of "MSG_ID_CELL_INFO_PRINT sn=11 cellid=5;" and "MSG_ID_CELL_CAMP_REQ sn=15 cellid=2;" is different, this information block what I want; 

MSG_ID_CELL_INFO_PRINT sn=1 cellid=2; 
MSG_ID_CAMP_RSP sn=2 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=3 cellid=5;
MSG_ID_CELL_INFO_PRINT sn=5 cellid=2;
MSG_ID_CAMP_RSP sn=6 cellid=4; 
MSG_ID_CAMP_RSP sn=8 cellid=2;  
MSG_ID_CELL_INFO_PRINT sn=10 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=11 cellid=5; 
MSG_ID_CAMP_RSP sn=12 cellid=2; 
MSG_ID_CAMP_RSP sn=14 cellid=3; 
MSG_ID_CELL_CAMP_REQ sn=15 cellid=2;

[download]

And the "cellid" of "MSG_ID_CELL_INFO_PRINT sn=24 cellid=2;"and "MSG_ID_CELL_CAMP_REQ sn=25 cellid=2;" is same, so this information block is not what I want 

MSG_ID_CELL_INFO_PRINT sn=16 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=17 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=18 cellid=2; 
MSG_ID_CAMP_RSP sn=19 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=20 cellid=5; 
MSG_ID_CELL_INFO_PRINT sn=21 cellid=2;
MSG_ID_CAMP_RSP sn=22 cellid=4; 
MSG_ID_CAMP_RSP sn=23 cellid=2;  
MSG_ID_CELL_INFO_PRINT sn=24 cellid=2;  
MSG_ID_CELL_CAMP_REQ sn=25 cellid=2;

[download]

This is my code, I can not figure out how to solve the "nearest compare". 

my $str = shift; #the data showed in the above
my $beg = "MSG_ID_CELL_INFO_PRINT";
my $end = "MSG_ID_CELL_CAMP_REQ";
my $key1 = "cellid=";
my $key2 = ";";
while ($str =~ m/$beg.*?$key1(\d+)(.*?)$end(.*?)$key1(\d+)/g) {
 my $info_cell = $2;
 my $camp_cell = $4;
 if ($info_cell ne $camp_cell) {
  my $cell_info = $beg.$1.$key1.$2.$end;
  while ($cell_info =~ m/$beg(.*?)$key2/g) {
  my $print_info = $1;
  print FILEOUT "$beg.$print_info";
  }
 }
}

[download]

The problems of the code are that: first, it compare the first occurrence of the "MSG_ID_CELL_INFO_PRINT" with the "MSG_ID_CELL_CAMP_REQ", for example, sn=1 vs sn=15, which should be sn=11 vs sn=15; Second, once the number of compared value increase, it will be troubled. Also, I can not put the content of the message "MSG_ID_CELL_CAMP_REQ" into file. Any suggestions will be helpful, Thanks!

In reply to Extract all occurrence of one msg and compare the value of the msg which is closest to the end msg by dwslovedh

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