title: Does NSRegularExpression support partial case insensitive?
body: <p>As the title states, I wonder if NSRegularExpression in both Objective-c or Swift, support partial case insensitive search?</p>
  
  <p>Namely, will the pattern recognize (?ismx)? If not, is there a brief reason for this inability?</p>
  
  <p>I truly appreciate your explanation. </p>