> does not (at least to my eyes) show what the difference is between them.
you are comparing
in your example there is no difference, but in the second approach with pattern the reach of modifiers is limited to the group.
DB<24> p 'xX' =~ /(?i:X)X/
1
DB<25> p 'xX' =~ /(?i:X)x/
DB<26> p 'xX' =~ /(?i)Xx/
1
DB<27>
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