How to split value in single quotes after specific string

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The image shows a regular expression designed to capture segments of the string "Cannot add user" followed by a username within square brackets, which is being tested against strings indicating user errors in a test string field. (Captioned by AI)
The image shows a regular expression designed to capture segments of the string "Cannot add user" followed by a username within square brackets, which is being tested against strings indicating user errors in a test string field. (Captioned by AI)886×190 11.9 KB

(?<=Cannot add user. ['‘]).*?(?=['’])

we cannot rely on inverted single quotes like ‘ as it could be a copy paste issue but can handle defensive it