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Originally Posted by Sabardeyn
I cannot think of the exact regex you would need. Roughly, it would probably be the identifier's name, a colon and then "all characters, greedy, until the next whitespace/word end". So something like... ID:+.? Or is it ID:.+? Hmm.. think I'm missing the word boundary. Anyway, I'm not sure if the expression is written correctly. But hopefully you've got the idea. I imagine that the colon might need to be escaped.
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When S&Ring the identifiers field, each identifier acts as a self-contained unit. So the regex would be ".*", and replaced with a null value.
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I would definitely suggest trying this on a sample database. Just to make sure that it doesn't harm anything else. Maybe create a new library and then copy various sample books into it, run the regex and see what happens.
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I second the idea of testing this out first, always a good idea when doing Bulk S&R -- with a powerful tool like that, you have room to mess up quite badly.