I\'m running into an issue that I hope is simple, however I\'ve run into a wall trying to figure it out. I\'m attempting to strip the DateTime timestamp from the beginning
As others have pointed out, you are using strip incorrectly. Instead, since you already have matching working, slice off the number of characters from the start of the string.
result = line[:len(a.group())]
print(result)
# prints ' testc'