[A-z] will match ASCII characters in the range from A to z, while [a-zA-Z] will match ASCII characters in the range from A to Zand in the range from a to z. At first glance, this might seem equivalent — however, if you look at this table of ASCII characters, you’ll see that A-z includes several other characters. Specifically, they are [, \, ], ^, _, and ` (which you clearly don’t want).
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