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I think you got how to look for (lower case, uppercase, space) pattern. Just bare in mind that the "Match" configurationg mode of the AlteryxRegex tool is looking for exact FULL matches, rather than partial. I believe your expression is not going to give you the match that you want. I'd place a .* before your expression.
Hopefully the attachment will clarify what I mean.
Also, I'd recommend to look at the pre-built RexEx examples in Designer (right click on the RegEx tool -> open example).
As already suggested, I also use Regex101.com or Regexr.com to test expressions quickly, before building them in Designer.