Regex-check-for-null

What is the correct Regex syntax to find an "empty string" (i.e. empty field) in ... not possible (the original post is from Feb 2017, so I thought it worth checking!)

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regex-check-for-null

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https://guetuvisira.wixsite.com/dasacapheatw/post/stretching-routine-vlcsnap-2017-11-17-13h12m32s783-imgsrc-ru

https://balnifetamarmikelb.wixsite.com/olverwanist/post/spring-2019-f-full-version-download-activator-serial-final

https://achsmyrarunutlib.wixsite.com/bikdtihobu/post/visual-certexam-suite-3-4-2-by-joop2001-rar-full-file-download-iso-32