I need a regular expression that will match any three uppercase letters, so AAA or ABC or DKE. It can't match four or more though, like AAAA or ABCDEF or aBBB.
My solution: ^([A-Z][A-Z][A-Z])$
Questions:
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regex
Your solution is correct, but there is some redundancy in your regex.
The similar result can also be obtained from the following regex:
^([A-Z]{3})$
The {3}
indicates that the [A-Z]
must appear exactly 3 times.
Source: Stackoverflow.com