^[A-Za-z][A-Za-z0-9]*$ regular Expression?

avta77

New Member
The above expression is working fine. this expression means first leter should start with characters only not a digit, remaining letters alphanumarics. but it not allow when i give underscore like "s_sasi" it is giving error message can u help me i want to allow the underscore also in that expression thank u
 
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