Regex works on shorter expressions but shows null value when I add a wordes before the capture group

I want to scrape the whole element containing all the data I need because the order of the data is not uniform, so individual selectors is not an option for me. So, I used regex to get a match, and have it displayed on a data preview so that all products use that regex expression.

the sitemap is:


and the regex is:

Processor Base Frequency\s(\d+.\d+\s?[MGgm]Hz)

The expected output once scraped is 3.70 MHz and it works well in regex101(link below)

The actual output is null

If I remove the keywords Processor Base Frequency on the webscraper, I get a valid result of 4.50 GHz but what I need is the Processor Base Frequency.