Substring extraction without "Text to Columns"

Hi all,
I am unsure how to manipulate substrings without performing "text to columns".
Background:
Our sheet looks for and extracts data from a source based on unique identifiers. At times, the source will change the unique identifiers. Eg: v123456 may change to v654321. I have created some code that performs a cansim number validation check. If the number exists, continue with the update process. If it does not exist, the code will reference the title that corresponds to the cansim number. Eg: v654321 represents "Copper Prices" (the title). If the title is found from the source file, I want to update our cansim number to match the source cansim number. The problem is, the source cansim number is embedded in the source title. Eg: Title "Copper Prices [1003] (v654321)", which is located in one cell. I want to extract just the "v" series number (v654321) and not the rest. How can I extract just the "v" series?
Hopefully I have described this well enough.

Best Regards: