Comment 16 for bug 1798187

+1 for the XUL regular expression.

FWIW, we had a library in our consortium that did have spaces in the barcodes themselves (not just the label, but the actual barcode content). These barcodes were handled so inconsistently in various Evergreen interfaces, that they finally gave up and rebarcoded all of those items to a format without spaces. I think we should document the standards and assumptions we have about barcodes somewhere, so that libraries new to Evergreen or thinking about their barcode schema can know what to expect. If others agree, I can open a new launchpad bug for that.