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RegEx possible optimizations and shorthand tricks

I attempted to create a RegEx that matched usernames with 1 to 20 characters and no more than one space (optional though). And by trial and error obtained this chunky RegEx:

[0-9A-Za-z]{3,20} ?[0-9A-Za-z]{1,20}

How can I optimize this RegEx to be shorter and generally better?

Via Active questions tagged javascript - Stack Overflow https://ift.tt/2FdjaAW
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