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FRegexPattern could be implicitly constructed from an FString, which made it easy to accidentally pass an FString as the first argument to the FRegexMatcher constructor, and get a matcher which outlived the pattern it was using. This changes the FRegexPattern constructor to be explicit (as you should choose to make a pattern, since it's not cheap), and also has FRegexMatcher keep a copy of the pattern it was constructed with, to ensure that the matcher can't outlive its pattern. FRegexMatcher has also been made non-copyable, as it contains state that shouldn't be accidentally shared. FRegexPattern is now both movable and copyable, as internally it references an immutable instance so can be safely shared. #rb Patrick.Laflamme #preflight 606cc0dd2be7080001dc6f75 [CL 15936453 by Jamie Dale in ue5-main branch]