Need Help Identifying LB and RB for web_req_save_param

Hello All,

 I have been attempting to create a dynamic run time variable in a Load Runner script. I am using web_req_save_param in the hopes of being able to capture and use this value. Unfortunately I am having a devil of a time with the LB and RB values and ultimately identifying the dynamic value.

I have been attempting to use a reply with server data being shown. I have copied and pasted this data returned by server in order to correctly identify the LB and RB values. Unfortunately this is not working thus far. As such I am asking you fellow LoadRunners for some help! Below is the output from the server which surrounds the data I am loooking for:

<br />\rLEC (4345)</span><!-- CLASS_NAME$0 -->\n  

** What I want to capture is the 4345 numerical value.

Here is what I currently have, which is not working:

 web_req_save_param ("class_swap_number", "NOTFOUND=ERROR","LB=<br />\\rLEC (","RB=)</span><!-- CLASS_NAME","Ord=ALL", LAST);

ANY input or direction you can provide is MUCH appreciated!