Create campaign IDs using REGEXEXTRACT()

After much thought, and testing different naming conventions, the digital marketing director and the social media team have finally settled on a naming convention. They have decided to simply create campaign IDs.

These IDs will contain information about the source and campaign. For instance, the test IDs you create will be in the following format: the first letter from the Source, followed by an underscore, then the full Campaign Name. For example, the campaign ID for the source Yahoo with a campaign Spreadsheets would be: Y_Spreadsheets.

Recall that a begin anchor is ^. For example, ^f will match the f in flying. However, in this exercise you will need to be able to match the first letter from any word.