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Help with a regular expression.

brgdotnet
brgdotnet asked
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Last Modified: 2012-05-06
I have a regular expression used for input to a textbox control
Hello, I need help understanding a regular expression. (There are two parts to my question.) Here is my regular expression:
ValidationExpression="^[a-zA-Z'.\s]{1,40}$"
I interpret it to ensure the following constraints:
1.) alphanumeric characters only a-z and A-z
2.) Max 1-40 characters
Now what does the ^ character stand for, and the .\s

That is part 1 of my question.

Part 2,
Please modify the regular expression to prevent blank characters. This might be tricky. You see I need to prevent the user from entering nothing into a text box, or just blank spaces.  (Note for various reasons, I am not allowed to use a required field validator control)

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