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Regular expression syntax

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Problem Detail: 

am a little confused by regular expression to convert to NFAs. am actually test using

but some of regular expression like


is that mean (a*)+ is that correct ..



how can i get b*+ or that mean (ab*)+ i do not know how to get it ?

however is the (a*)+ is the same a+ , i think will match the same ?

Asked By : Yassine
Answered By : David Richerby

From the examples you give, the site you're using appears to be using "+" to mean "or". Other people use "|" for that but both notations are common enough that they can be called standard.

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