Need Regular Expressions for asp.net [closed]

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I have three text boxes. I need:

1. Regular expression to only allow 3 upper case alphabets. No empty strings and no numbers
2. Regular expression to allow only 3 numbers. no empty strings
3. Regular expression for 5 or fewer uppercase alphabe开发者_JS百科ts only. no empty strings, no numbers

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This should do it:

1. ^[A-Z]{3}$
2. ^[0-9]{3}$
3. ^[A-Z]{1,5}$

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Expresso is a usefull regular expression tool that allows you to build your own regular expressions by selecting options from a form. It will be very easy to create what you have asked for above.