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I'm using the followin regular expression validator. &nbsp; 
 
ValidationExpression=&quot;^([a-zA-Z].*|[0-9].*)\.(((p|P)(d|D)(f|F))|((d|D)(o|O)(c|C))|((p|P)(d|D)(f|F))|((d|D)(o|O)(c|C)(x|X))|((t|T)(i|I)(f|F))|((t|T)(i|I)(f|F)(f|F))|((w|W)(p|P)(s|S))|((w|W)(p|P)(d|D))|((r|R)(t|T)(f|F)))$&quot; 
 
I don't understand the &quot;=^([a-zA-Z].*|[0-9].*)\.&quot; 
Can someone please help me translate this? 
 
Thank you!
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I'm using the followin regular expression validator.  

ValidationExpression="^([a-zA-Z].*|[0-9].*)\.(((p|P)(d|D)(f|F))|((d|D)(o|O)(c|C))|((p|P)(d|D)(f|F))|((d|D)(o|O)(c|C)(x|X))|((t|T)(i|I)(f|F))|((t|T)(i|I)(f|F)(f|F))|((w|W)(p|P)(s|S))|((w|W)(p|P)(d|D))|((r|R)(t|T)(f|F)))$" 

I don't understand the "=^([a-zA-Z].*|[0-9].*)\."
Can someone please help me translate this?

Thank you!

regular expression validation

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