Character Classes

Pattern	Description
`[abc]`	A single character of: a, b or c
`[^abc]`	A character except: a, b or c
`[a-z]`	A character in the range: a-z
`[^a-z]`	A character not in the range: a-z
`[0-9]`	A digit in the range: 0-9
`[a-zA-Z]`	A character in the range:a-z or A-Z
`[a-zA-Z0-9]`	A character in the range: a-z, A-Z or 0-9

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