See for more information on how the characters work.

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See Some Examples
^ tr [a-e] [^e] $
Must start with 'tr' Start of word is 'tr' 3rd letter is a,b,c,d,e 4th letter is not e Nothing trailing after previous
^ . e t .*
Nothing before the start Any letter 2nd letter = e 3rd letter = t Any number of letters