Regular expression to match 'R33' and 'r34E' [closed]

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I am looking for a regular expression that matches R33 and r34E. I tried (R|r)[0-9]{2}+[A-Z]{1} but got an error.

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/[rR][0-9]{2}[A-Z]?/

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It is an invalid Regular Expression. If you want to have 2 or more digits, {2}+ won't work, you should use {2,}.

(R|r)[0-9]{2,}[A-Z]?

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[0-9]{2}+

That plus sign looks wrong. If you take that out:

(R|r)[0-9]{2}[A-Z]?

Appears to do what you want (upper- or lowercase R, two digits, optionally any uppercase letter).

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Try ^(R|r)[0-9]{2}$|^(R|r)[0-9]{2}[A-Z]{1}$

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Your regex is invalid.

You can use {2} or + on an expression, but not both.