A general regex pattern which might fit your need is:



[A-Za-z0-9]+      an initial alphanumeric term
(?:               (open non capturing group)
    \s*           optional whitespace
    ,             comma separator
    \s*           more optional whitespace
    [A-Za-z0-9]+  another alphanumeric term
)*                zero or more times (close non capturing group)

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