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Need Regular Expression which allows alphanumeric also & - _ special characters with only one space

Posted By:      Posted Date: April 14, 2011    Points: 0   Category :WPF

Need Regular expression

which allows alphanumeric along with  special characters like &  - _  with only one space between the letters.Special characters should not be at start and at the end of the input string.There should not be 2 successive special characters.

following scenario should accept:

asdd ads add


AS_df_23 ff-f


Following Scenario should not accept:


Asd   fff



only special characters



Please suggest solution for above scenario.






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