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Need explanation on how Lookahead example work

 
Jack Bush
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Hi All,

I need your advice on explaining how the following regular expression example, illustrated on the last paragraph from
http://www.regular-expressions.info/lookaround.html:



I just understand how there is a mis-matched between after the lookahead had been discarded. Moreover, what is the correct regular expression?

Thanks a lot,

Jack
 
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