@user_none
I have been seeing some inconsistent (7.x) REGEX S&R recently
I might be confused about the use of #1 (I am not a REGEX guru )
<b class="foo">words</b> <b class="foo">more words</b></p>
1)match Minimal ticked:
	Code:
	(?U)<b class="foo">(.+?)</b>\s
 would not find just a 
single 'b' tag pair 
 
I did something else then came back:
Then it just started working 

. I tried just the minimal tick, Just the (?U)  , both.
2) wrap Not Ticked still wraps within the current file if All HTML selected and using 
Replace/Find  (I was wrapping 
carefully chosen words in a tag pair and noticed OMG, I had already wrapped that word before, twice 

 ) Wrap was not ticked