Pattern Matching and Parsing

I've hit a wall on three little problems; hoping I can get some help.
1. I'm searching for an account number in my credit card account statement file, using Contents/Contain Match with a pattern of: numbers<space>numbers<space>numbers<space>numbers. Basically, I want to find the entire account string. But I want to use just the last four digits in renaming of the file. Any suggestions on how to strip out the last four digits for the file name?
2. I want to find the begin and end dates for the statement. They appear on a line that looks something like this:
Opening/Closing Date 05/18/14-06/17/14
After many permutations, my only successful match occurred when I set up a custom date (MM/DD/YY) and matched the second and third occurrences of the dates (the first occurrence being the payment due date). Well, that's okay as far as it goes, but I'd rather key off of the "opening/closing date" label to better identify the dates. The problem is that I can't come up with the syntax for a possible match. I've used various combinations of the label, spaces, and "anythings" without success. Any ideas?
3. Similar to problem 1, I want to locate the account balance for renaming the file. The only successful match was:
Anything $Numbers,Numbers successfully match $2,456.78. How can I strip out the comma (I know, ticky) so I can simply use 2456 in the file rename?
Sorry for what might be obvious questions. Newbie here. JV
1. I'm searching for an account number in my credit card account statement file, using Contents/Contain Match with a pattern of: numbers<space>numbers<space>numbers<space>numbers. Basically, I want to find the entire account string. But I want to use just the last four digits in renaming of the file. Any suggestions on how to strip out the last four digits for the file name?
2. I want to find the begin and end dates for the statement. They appear on a line that looks something like this:
Opening/Closing Date 05/18/14-06/17/14
After many permutations, my only successful match occurred when I set up a custom date (MM/DD/YY) and matched the second and third occurrences of the dates (the first occurrence being the payment due date). Well, that's okay as far as it goes, but I'd rather key off of the "opening/closing date" label to better identify the dates. The problem is that I can't come up with the syntax for a possible match. I've used various combinations of the label, spaces, and "anythings" without success. Any ideas?
3. Similar to problem 1, I want to locate the account balance for renaming the file. The only successful match was:
Anything $Numbers,Numbers successfully match $2,456.78. How can I strip out the comma (I know, ticky) so I can simply use 2456 in the file rename?
Sorry for what might be obvious questions. Newbie here. JV