A Textbox Validation (Only Doubles) Needs C# Gurus :-)

Question

I want accept such number formats in my textbox. These numbers are all doubles.

• 2.6
• 45e-2
• 23e32
• +0.05
• -0.07e+5

So my textBox must allow these:

• Maximum one "e" or "E" letter
• "e" or "E" letter can't be at the end or at the beginning
• "+" and "-" characters are allowed
• "+" or "-" character can be only at the beginning of the number or behind the "e" OR "E" letter
• All conditions must be valid for ctrl+V, mouse paste or typing
• Maximum one "." charater before a number but not after an "e" letter.

What code do you suggest me? Thanks for all...