Correlation

I am trying to catch a value using the following Left Boundary and Right Boundary from a server Response:

web_reg_save_param("Test","LB=subscriptionId\"value=\"","RB=\"",LAST);

I am pasting the part of server Reposne from where I got these boundaries.Can anyone tell me whats wrong with the above function as Data is not getting saved .

<input type=hidden name="statusList[0].subscriptionId" value="80578543989158605946
Action.c(30):     5860404565121081710826497" />\n

Rgds