specify regex for alternating between strings?

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Given n arbitrary strings, s1, ..., sn, how can I specify a RegEx that can match all the strings?

For example,

I am not smart.

If I want to match am and ar, I can use a[mr]. But I don't know how to match am and not, because brackets can only specify a set of characters, not a set of strings.

Another example, How can I match both a* and b*? Are there any particular way for this particular example?

Thanks.

asked 27 secs ago

Tim

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