What's wrong with matching how you described it?

/_[a-z]+\d/

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You haven't shown us what you tried. If you provide a small, self-contained example, that makes it much easier for us to try out the examples against your data.

In reply to Re: Regex pattern that fails when string contains a certain pattern by Corion
in thread Regex pattern that fails when string contains a certain pattern by hoppfrosch

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