monger:
You said you don't want the first set of date/time info, nor the "WARNING" ... so why capture them at all? Use non_captureing parens, (:...) for that which you are using merely as a marker for the string you want.
Please read the two items surrounding kaif's question... (Aargh; seem to have sent reply to kaif's to bitbucket, so repeating below) and more particularly (or, at least, even more diligently) the suggestions from holli, et al.
Update:
(?=WARNING) is a lookahead (aka lookaround), which
- matches at the POSITION or "location" before "WARNING" (ie, uses "WARNING" as a marker to delimit the prior part(s) of the regex; you can think of this as a way to limit greediness, tho that's very sloppy language) but...
- does not capture "WARNING"!
so...
the second "WARNING" in the regex matches the word itself which therefore gets included (along with the trailing \s, space) in the NON_capture, (?:...)
HTH
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