regular expressions in abbreviations

Hi all, I'm looking for a way to use regular expressions in abbreviations. For example,

:iab \([0-9]\{-}\)nm \\SI{\1}{\\nano\\meter}

would would expand every instance of, '50nm' to '\SI{50}{\nano\meter}'. Is this possible? It's been suggested to imap a regular function, but this is not so satisfying.

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