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[aA] means either a or A.
[a-z] matches any lowercase character.
[0-9] matches any digit.
[0-9a-zA-Z] for characters commonly used in variable names.
You can combine the brackets with other patterns.
Pattern Interpretation
/[aA]/ Matches against a or A.
/[aA]+/ Matches one or more instances of a or A.
/[aA]*/ Matches zero or more instances of a or A.
/[aA]?/ Matches zero or one instance of a or A.
/[^aA]/ Returns true if any character is found that is not a or A.
/[aA]|[bB]/ Matches an instance of a or A or b or B; redundant in this case, as it is the same as /[aAbB]/.
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