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First regex: String with foObar, foobBar should match but not fOobar, foobbar
Second regex: String with fOobar, fooBbar should match but not foObar, foobbar
Third regex: should match both – foObar, fOobar, fooBbar, foobBar
For first regex I tried the following without success:
sed -nE '/([a-z])\U\1/p' <<<foObar
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