Chars.

Character set — compare

Set

Set #1: $unicode:Zs; [\u0020\u00A0\u1680\u2000-\u200A\u202F\u205F\u3000]
Set #2: $unicode:White_Space; [\u0009-\u000D\u0020\u0085\u00A0\u1680\u2000-\u200A\u2028-\u2029\u202F\u205F\u3000]
Common set: [\u0020\u00A0\u1680\u2000-\u200A\u202F\u205F\u3000]
Only in #1: []
Only in #2: [\u0009-\u000D\u0085\u2028-\u2029]