Quoting myself because you missed it.
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So you are telling it to check at the beginning of the string with the ^ symbol. Group 1 you look for Zero or more non space chars. Then for the default group (which isn't really a group) you look for Zero or more spaces. Then Group 2 you look for Zero or more non space chars. The default group again for Zero or more spaces. Then Group 3 you look for Zero or more non space chars. Then a third time, the default group again for Zero or more spaces. Then Group 4 you look for Zero or more non space chars. The last group matches up to the end of the string with the $ symbol, as long as it isn't a space.
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On the page I listed it tells you what the capital version does and I even said what it does in my previous post, 4 times. Sorry. Good luck with that.