First post here.  Using UE 25.10.0.50 on Windows 10 x64 (1803 build).

I have an XML file with multiple <Event ID> and closing </Event> tags.  Between these tags there should be a <Modified> tag, but in some instances it's missing.

The <Modified> tag doesn't have a specific position - it could come between 1-10 lines after <Event ID> and 1-10 lines before </Event>.

How can I search for the missing <Modified> tags?

Thanks in advance,
LQH

Hi luoqianhe

this should solve your problem:
(?s)<(?<TAG>Event ID)\b[^>]*+>(?>(?:(?!<\k<TAG>\b)(?!</\k<TAG>\b)(?!<Modified\b).)++)*+</\k<TAG>>

You can find more information here: Which RegExp to find a block of several lines, thanks to criteria relative to first and last line of the block

BR, Fleggy

EDIT: sorry, the string ID should not be a part of the tag name. Here the correct and simpler search string
(?s)<(?<TAG>Event) ID\b[^>]*+>(?:(?!<\k<TAG>\b)(?!</\k<TAG>\b)(?!<Modified\b).)++</\k<TAG>>

Thanks, fleggy!

LQH