Regexp for password validation

Question

I'm creating a regexp for password validation to be used in a form.

• First letter should not be a special character. (Like this @abc12n.aa)
• First letter should be a alphabetic OR alphanumeric.
• And the remaining characters to be alphabetic or alphanumeric or any of the following special
  characters.(Like this Abc123@com or abc@123.sol)

I have tried this format

regexp[^[a-zA-Z0-9][a-zA-Z0-9@#%&]$]

but this is not working,can any one help on this

Answer 1

^[a-zA-Z0-9][a-zA-Z0-9@#%&.]*$

try this.This will work for you.See demo.

https://regex101.com/r/iY3eK8/4