Answers ( 3 )

  1. Range Expression- Accept ANY ONE of the character in the range, e.g., [0-9] matches any digit; [A-Za-z] matches any uppercase or lowercase letters, ‘.’ (dot): ANY ONE character except newline

  2. include all alphanumeric characters along with -and .

  3. “.” means any one character except line break. So it means any one character which is alphanumeric (lowercase and uppercase)

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