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The community pattern shelf.
Useful expressions with the context intact—publicly shared, clearly explained, and safe to remix.
By Nelson Eduardo
SKU with marketplace
$ pattern
/^(?:\d+|MK[A-Za-z0-9]+)(?:-[1-9]\d?)?$/gmiWhat it matches A username containing letters, numbers, underscores, or hyphens. Constraints - Between 3 and 16 characters -
Published 10/23/2026 By Nelson Eduardo
Untitled regex
$ pattern
/^(?:\d+|MK[A-Za-z0-9]+)(?:-[1-9]\d?)?$/gmiWhat it matches A username containing letters, numbers, underscores, or hyphens. Constraints - Between 3 and 16 characters -
Published 10/23/2026