Help on Regular Expression

[John]

I am new in Regular Expression. Could someone please help me in following
expression?
1. the string cannot be empty
2. the string can only contains AlphaNumeric characters. No space or any
special characters are allowed
3. space characters at the end of string is ok
4. the string cannot contains only numeric characters, in other word, the
string must contains a least one alpha character

I need to put a RegularExpressionValidator on the form and use the Regular
Expression to validate a textbox on the form

Thanks for the help

 

[Rob Vretenar]

Try this out
^(?=[a-zA-Z]+)(?=[0-9]?)(?!.*\s)[a-zA-Z0-9]*$

It doesn't handle spaces at the end.
If you need more help, there's a good tutorial at
http://www.regular-expressions.info

There's also a built up library of expresions at
http://www.regexlib.com

I also use Expresso to help build and text regular expressions. You
can find it at http://www.codeproject.com

Rob Vretenar [imason inc.]